We already have the voltage, I need to check on what is set by default by the rpm...
not just the DTS, the code doesn't support the L2 cache scaling with a different freq to the core.
BTW you've done great work on this, been snowed under IRL and have not had the energy to work on the L2 stuff. i'm sure all the ipq806x guys out there are very appreciative.
I certainly appriciate all the hard work done by everyone in openwrt... I need an "openwrt for dummies" book to understand it all though.
1 Like
I have a short question to @facboy and @Ansuel
Does anybody knows was the L2 Scaling Issues bug fixed in 19.07.x or not?
Maybe that issue was fixed in 'master' or some other custom build?
I mean the bug discussed above where L2 Frequency scales with CPU frequency linearly instead of proper implementation (according to above post and Code Aurora 'powerctl' comments):
- 384 Mhz when idle
- 1.0 Ghz at 600, 800, 1000
- 1.2 GHz at 1400, 1725
PS: I have briefly tested my fresh 19.07 installation and found out that L2 cache frequency is strictly set to a minimum supported value of 384MHz while running CPU at 600MHz and 800MHz.
That was a very disappointing discovery.
IMHO such an artificial slowdown of the L2 cache frequency can have an extremely negative impact not only on memory bandwidth but on the soft-IRQ processing performance also.
It would be interesting to measure IRQ processing speed for the different L2 cache frequencies.
By comparing results it would be possible to evaluate the impact to the system latency and responsiveness that was introduced by the forced down-clocking of the L2 cache for 600/800MHz CPU freqs.
The only thing - I do not know how to measure soft-IRQ performance, what tool could be used to perform such tests.
19.07 / ondemand / CPU freq: min 600 max 600
L2 Cache freqs: Idle | Under max LOAD
/sys/kernel/debug/clk/acpu_l2_aux/clk_rate 384000000 384000000
/sys/kernel/debug/clk/hfpll_l2/clk_rate 1200000000 1200000000
/sys/kernel/debug/clk/hfpll_l2_div/clk_rate 600000000 600000000
/sys/kernel/debug/clk/krait_l2_pri_mux/clk_rate 384000000 > 384000000 <
/sys/kernel/debug/clk/krait_l2_sec_mux/clk_rate 384000000 384000000
19.07 / ondemand / CPU freq: min 800 max 800
L2 Cache freqs: Idle | Under max LOAD
/sys/kernel/debug/clk/acpu_l2_aux/clk_rate 384000000 384000000
/sys/kernel/debug/clk/hfpll_l2/clk_rate 1200000000 1200000000
/sys/kernel/debug/clk/hfpll_l2_div/clk_rate 600000000 600000000
/sys/kernel/debug/clk/krait_l2_pri_mux/clk_rate 384000000 > 384000000 <
/sys/kernel/debug/clk/krait_l2_sec_mux/clk_rate 384000000 384000000
1 Like
i only ever run some variant of master. but given that i posted in dec 19 and 19.07 would have been cut in jul 19, i would guess it's never been in 19.07 even if it is in master. pretty sure @Ansuel merged some variant of it into master when we updated to kernel 5.4.
the current cpufreq driver address 2 main problem
- cache can't be run a 384 with other core at 1 ghz (so anything must be at 384)
- any transition from 384 to 1.4 is first set to the low value... (384) before scaled
in theory this should fix the problems... if you still find problem they could be caused by 1 and 2 should be removed
1 Like
does someone want to do some test in the free time?
I need to test something
The test is to build a custom image with a modded cpufreq driver
Then use mbw and test if the cache scaling issue is present
I can do it.
@facboy can you give me some hint if you notice some problem in this output?
This is a running system with wifi and all watching twich right now
root@No-Lag-Router:/tmp/openwrt-r7800-freq-test-master# ./set_scaling_max_freq.sh -m 384 600 800 1000 1400 1725 800 1000 1400 1725 600 600
600 1000 1000 1000 1000
Setting scaling_max_freq to 384000
cpu0 cur_freq: 384000
cpu1 cur_freq: 384000
AVG Method: MEMCPY Elapsed: 0.05134 MiB: 16.00000 Copy: 311.631 MiB/s
AVG Method: DUMB Elapsed: 0.52978 MiB: 16.00000 Copy: 30.201 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04965 MiB: 16.00000 Copy: 322.228 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.03255 MiB: 16.00000 Copy: 491.490 MiB/s
AVG Method: DUMB Elapsed: 0.32122 MiB: 16.00000 Copy: 49.810 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03198 MiB: 16.00000 Copy: 500.375 MiB/s
Setting scaling_max_freq to 800000
cpu0 cur_freq: 800000
cpu1 cur_freq: 800000
AVG Method: MEMCPY Elapsed: 0.02887 MiB: 16.00000 Copy: 554.299 MiB/s
AVG Method: DUMB Elapsed: 0.20144 MiB: 16.00000 Copy: 79.429 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03076 MiB: 16.00000 Copy: 520.178 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02973 MiB: 16.00000 Copy: 538.112 MiB/s
AVG Method: DUMB Elapsed: 0.16321 MiB: 16.00000 Copy: 98.035 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02929 MiB: 16.00000 Copy: 546.183 MiB/s
Setting scaling_max_freq to 1400000
cpu0 cur_freq: 1400000
cpu1 cur_freq: 1400000
AVG Method: MEMCPY Elapsed: 0.02492 MiB: 16.00000 Copy: 642.116 MiB/s
AVG Method: DUMB Elapsed: 0.11526 MiB: 16.00000 Copy: 138.813 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02461 MiB: 16.00000 Copy: 650.219 MiB/s
Setting scaling_max_freq to 1725000
cpu0 cur_freq: 1725000
cpu1 cur_freq: 1725000
AVG Method: MEMCPY Elapsed: 0.03135 MiB: 16.00000 Copy: 510.325 MiB/s
AVG Method: DUMB Elapsed: 0.09918 MiB: 16.00000 Copy: 161.319 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03332 MiB: 16.00000 Copy: 480.195 MiB/s
Setting scaling_max_freq to 800000
cpu0 cur_freq: 800000
cpu1 cur_freq: 800000
AVG Method: MEMCPY Elapsed: 0.04237 MiB: 16.00000 Copy: 377.643 MiB/s
AVG Method: DUMB Elapsed: 0.22685 MiB: 16.00000 Copy: 70.530 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04008 MiB: 16.00000 Copy: 399.178 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03900 MiB: 16.00000 Copy: 410.208 MiB/s
AVG Method: DUMB Elapsed: 0.16905 MiB: 16.00000 Copy: 94.649 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03789 MiB: 16.00000 Copy: 422.317 MiB/s
Setting scaling_max_freq to 1400000
cpu0 cur_freq: 1400000
cpu1 cur_freq: 1400000
AVG Method: MEMCPY Elapsed: 0.03301 MiB: 16.00000 Copy: 484.709 MiB/s
AVG Method: DUMB Elapsed: 0.11744 MiB: 16.00000 Copy: 136.242 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03103 MiB: 16.00000 Copy: 515.647 MiB/s
Setting scaling_max_freq to 1725000
cpu0 cur_freq: 1725000
cpu1 cur_freq: 1725000
AVG Method: MEMCPY Elapsed: 0.03229 MiB: 16.00000 Copy: 495.514 MiB/s
AVG Method: DUMB Elapsed: 0.10060 MiB: 16.00000 Copy: 159.047 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03152 MiB: 16.00000 Copy: 507.580 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.04720 MiB: 16.00000 Copy: 338.967 MiB/s
AVG Method: DUMB Elapsed: 0.32533 MiB: 16.00000 Copy: 49.181 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04495 MiB: 16.00000 Copy: 355.930 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.04518 MiB: 16.00000 Copy: 354.121 MiB/s
AVG Method: DUMB Elapsed: 0.33433 MiB: 16.00000 Copy: 47.857 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04542 MiB: 16.00000 Copy: 352.284 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.04607 MiB: 16.00000 Copy: 347.312 MiB/s
AVG Method: DUMB Elapsed: 0.33129 MiB: 16.00000 Copy: 48.296 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04627 MiB: 16.00000 Copy: 345.764 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03835 MiB: 16.00000 Copy: 417.214 MiB/s
AVG Method: DUMB Elapsed: 0.17045 MiB: 16.00000 Copy: 93.869 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03944 MiB: 16.00000 Copy: 405.730 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03937 MiB: 16.00000 Copy: 406.352 MiB/s
AVG Method: DUMB Elapsed: 0.16515 MiB: 16.00000 Copy: 96.882 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03940 MiB: 16.00000 Copy: 406.064 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03762 MiB: 16.00000 Copy: 425.328 MiB/s
AVG Method: DUMB Elapsed: 0.16697 MiB: 16.00000 Copy: 95.825 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03704 MiB: 16.00000 Copy: 432.010 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03988 MiB: 16.00000 Copy: 401.227 MiB/s
AVG Method: DUMB Elapsed: 0.16731 MiB: 16.00000 Copy: 95.631 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03849 MiB: 16.00000 Copy: 415.641 MiB/s
what i'm testing here is if the problem was caused by cpu running at low freq with cache running at 1ghz+ and removing the workaround to set the cache to idle freq before scaling
what governor is that on? if it's on performance it's not right, at 1.4 and 1.7g it should be getting 650+MB/s, 130+MB/s, 650+MB/s or so. all those results around 400M are not right.
this is on mine:
t# ./set_scaling_max_freq.sh -m 384 600 800 1000 1400 1725 800 1000 1400 1725 600 600 600 1000 1000 1000 1000
Setting scaling_max_freq to 384000
cpu0 cur_freq: 384000
cpu1 cur_freq: 384000
AVG Method: MEMCPY Elapsed: 0.04424 MiB: 16.00000 Copy: 361.664 MiB/s
AVG Method: DUMB Elapsed: 0.47620 MiB: 16.00000 Copy: 33.599 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04474 MiB: 16.00000 Copy: 357.624 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.03243 MiB: 16.00000 Copy: 493.338 MiB/s
AVG Method: DUMB Elapsed: 0.28509 MiB: 16.00000 Copy: 56.123 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02988 MiB: 16.00000 Copy: 535.511 MiB/s
Setting scaling_max_freq to 800000
cpu0 cur_freq: 800000
cpu1 cur_freq: 800000
AVG Method: MEMCPY Elapsed: 0.02820 MiB: 16.00000 Copy: 567.446 MiB/s
AVG Method: DUMB Elapsed: 0.18499 MiB: 16.00000 Copy: 86.490 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03003 MiB: 16.00000 Copy: 532.785 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.03252 MiB: 16.00000 Copy: 491.938 MiB/s
AVG Method: DUMB Elapsed: 0.17978 MiB: 16.00000 Copy: 89.000 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03760 MiB: 16.00000 Copy: 425.492 MiB/s
Setting scaling_max_freq to 1400000
cpu0 cur_freq: 1400000
cpu1 cur_freq: 1400000
AVG Method: MEMCPY Elapsed: 0.02701 MiB: 16.00000 Copy: 592.470 MiB/s
AVG Method: DUMB Elapsed: 0.11439 MiB: 16.00000 Copy: 139.877 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02552 MiB: 16.00000 Copy: 626.954 MiB/s
Setting scaling_max_freq to 1725000
cpu0 cur_freq: 1725000
cpu1 cur_freq: 1725000
AVG Method: MEMCPY Elapsed: 0.02529 MiB: 16.00000 Copy: 632.656 MiB/s
AVG Method: DUMB Elapsed: 0.09081 MiB: 16.00000 Copy: 176.198 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02388 MiB: 16.00000 Copy: 670.036 MiB/s
Setting scaling_max_freq to 800000
cpu0 cur_freq: 800000
cpu1 cur_freq: 800000
AVG Method: MEMCPY Elapsed: 0.02979 MiB: 16.00000 Copy: 537.086 MiB/s
AVG Method: DUMB Elapsed: 0.19294 MiB: 16.00000 Copy: 82.925 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02814 MiB: 16.00000 Copy: 568.553 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02736 MiB: 16.00000 Copy: 584.729 MiB/s
AVG Method: DUMB Elapsed: 0.15168 MiB: 16.00000 Copy: 105.488 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02761 MiB: 16.00000 Copy: 579.473 MiB/s
Setting scaling_max_freq to 1400000
cpu0 cur_freq: 1400000
cpu1 cur_freq: 1400000
AVG Method: MEMCPY Elapsed: 0.02674 MiB: 16.00000 Copy: 598.435 MiB/s
AVG Method: DUMB Elapsed: 0.11472 MiB: 16.00000 Copy: 139.475 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02686 MiB: 16.00000 Copy: 595.746 MiB/s
Setting scaling_max_freq to 1725000
cpu0 cur_freq: 1725000
cpu1 cur_freq: 1725000
AVG Method: MEMCPY Elapsed: 0.02407 MiB: 16.00000 Copy: 664.866 MiB/s
AVG Method: DUMB Elapsed: 0.09042 MiB: 16.00000 Copy: 176.943 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02439 MiB: 16.00000 Copy: 656.007 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.03071 MiB: 16.00000 Copy: 521.006 MiB/s
AVG Method: DUMB Elapsed: 0.28277 MiB: 16.00000 Copy: 56.582 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03052 MiB: 16.00000 Copy: 524.272 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.03290 MiB: 16.00000 Copy: 486.356 MiB/s
AVG Method: DUMB Elapsed: 0.30361 MiB: 16.00000 Copy: 52.700 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03295 MiB: 16.00000 Copy: 485.533 MiB/s
Setting scaling_max_freq to 600000
cpu0 cur_freq: 600000
cpu1 cur_freq: 600000
AVG Method: MEMCPY Elapsed: 0.02993 MiB: 16.00000 Copy: 534.652 MiB/s
AVG Method: DUMB Elapsed: 0.28420 MiB: 16.00000 Copy: 56.299 MiB/s
AVG Method: MCBLOCK Elapsed: 0.03007 MiB: 16.00000 Copy: 532.019 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02928 MiB: 16.00000 Copy: 546.448 MiB/s
AVG Method: DUMB Elapsed: 0.15735 MiB: 16.00000 Copy: 101.682 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02844 MiB: 16.00000 Copy: 562.580 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02876 MiB: 16.00000 Copy: 556.251 MiB/s
AVG Method: DUMB Elapsed: 0.16007 MiB: 16.00000 Copy: 99.957 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02920 MiB: 16.00000 Copy: 547.893 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02874 MiB: 16.00000 Copy: 556.777 MiB/s
AVG Method: DUMB Elapsed: 0.16041 MiB: 16.00000 Copy: 99.746 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02908 MiB: 16.00000 Copy: 550.165 MiB/s
Setting scaling_max_freq to 1000000
cpu0 cur_freq: 1000000
cpu1 cur_freq: 1000000
AVG Method: MEMCPY Elapsed: 0.02750 MiB: 16.00000 Copy: 581.820 MiB/s
AVG Method: DUMB Elapsed: 0.15203 MiB: 16.00000 Copy: 105.245 MiB/s
AVG Method: MCBLOCK Elapsed: 0.02770 MiB: 16.00000 Copy: 577.657 MiB/s
is this with load or not?
some load, nothing v heavy.
EDIT: mind you this is an NSS build too.
oh wow i notice only now that i'm running the cache to 1.2ghz and not 1.4ghz... can 200mhz be that different?
can't understand why i can't reach the 650+
root@No-Lag-Router:/etc/config/openwrt-r7800-freq-test-master# ./mbw 32
Long uses 4 bytes. Allocating 2*8388608 elements = 67108864 bytes of memory.
Using 262144 bytes as blocks for memcpy block copy test.
Getting down to business... Doing 10 runs per test.
0 Method: MEMCPY Elapsed: 0.04169 MiB: 32.00000 Copy: 767.497 MiB/s
1 Method: MEMCPY Elapsed: 0.04292 MiB: 32.00000 Copy: 745.608 MiB/s
2 Method: MEMCPY Elapsed: 0.04208 MiB: 32.00000 Copy: 760.492 MiB/s
3 Method: MEMCPY Elapsed: 0.04288 MiB: 32.00000 Copy: 746.286 MiB/s
4 Method: MEMCPY Elapsed: 0.04139 MiB: 32.00000 Copy: 773.059 MiB/s
5 Method: MEMCPY Elapsed: 0.04228 MiB: 32.00000 Copy: 756.823 MiB/s
6 Method: MEMCPY Elapsed: 0.04212 MiB: 32.00000 Copy: 759.698 MiB/s
7 Method: MEMCPY Elapsed: 0.04335 MiB: 32.00000 Copy: 738.110 MiB/s
8 Method: MEMCPY Elapsed: 0.04192 MiB: 32.00000 Copy: 763.450 MiB/s
9 Method: MEMCPY Elapsed: 0.05502 MiB: 32.00000 Copy: 581.586 MiB/s
AVG Method: MEMCPY Elapsed: 0.04357 MiB: 32.00000 Copy: 734.521 MiB/s
0 Method: DUMB Elapsed: 0.18382 MiB: 32.00000 Copy: 174.083 MiB/s
1 Method: DUMB Elapsed: 0.18301 MiB: 32.00000 Copy: 174.851 MiB/s
2 Method: DUMB Elapsed: 0.18235 MiB: 32.00000 Copy: 175.486 MiB/s
3 Method: DUMB Elapsed: 0.18195 MiB: 32.00000 Copy: 175.872 MiB/s
4 Method: DUMB Elapsed: 0.18399 MiB: 32.00000 Copy: 173.920 MiB/s
5 Method: DUMB Elapsed: 0.18321 MiB: 32.00000 Copy: 174.666 MiB/s
6 Method: DUMB Elapsed: 0.18171 MiB: 32.00000 Copy: 176.100 MiB/s
7 Method: DUMB Elapsed: 0.18234 MiB: 32.00000 Copy: 175.492 MiB/s
8 Method: DUMB Elapsed: 0.18172 MiB: 32.00000 Copy: 176.095 MiB/s
9 Method: DUMB Elapsed: 0.18312 MiB: 32.00000 Copy: 174.749 MiB/s
AVG Method: DUMB Elapsed: 0.18272 MiB: 32.00000 Copy: 175.128 MiB/s
0 Method: MCBLOCK Elapsed: 0.04140 MiB: 32.00000 Copy: 772.891 MiB/s
1 Method: MCBLOCK Elapsed: 0.04190 MiB: 32.00000 Copy: 763.687 MiB/s
2 Method: MCBLOCK Elapsed: 0.04164 MiB: 32.00000 Copy: 768.547 MiB/s
3 Method: MCBLOCK Elapsed: 0.04181 MiB: 32.00000 Copy: 765.331 MiB/s
4 Method: MCBLOCK Elapsed: 0.04121 MiB: 32.00000 Copy: 776.586 MiB/s
5 Method: MCBLOCK Elapsed: 0.04190 MiB: 32.00000 Copy: 763.760 MiB/s
6 Method: MCBLOCK Elapsed: 0.04130 MiB: 32.00000 Copy: 774.800 MiB/s
7 Method: MCBLOCK Elapsed: 0.04104 MiB: 32.00000 Copy: 779.651 MiB/s
8 Method: MCBLOCK Elapsed: 0.04162 MiB: 32.00000 Copy: 768.861 MiB/s
9 Method: MCBLOCK Elapsed: 0.04527 MiB: 32.00000 Copy: 706.807 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04191 MiB: 32.00000 Copy: 763.546 MiB/s
ok....
No luck... it seems the workaround is still needed but i think there is a wrong implementation in the qcom clk driver... i will have some fun using their bad implementation and checking if this solves the workaround....
I honestly don't really like the fact that to scale the cpu cache, it must be set twice...
not sure it isn't required though, there is some comment somewhere in one of the qsdk drivers about needing a pulldown before switching clock speeds. it's what made me try it in the first place.
1 Like
can you find that comment?
not until at least the weekend. it was ages ago :(.
1 Like
For the sake of science/statistics.
Linux 5.10.37 (DSA) - ondemand
AVG Method: MEMCPY Elapsed: 0.04424 MiB: 32.00000 Copy: 723.300 MiB/s
AVG Method: DUMB Elapsed: 0.18647 MiB: 32.00000 Copy: 171.613 MiB/s
AVG Method: MCBLOCK Elapsed: 0.05025 MiB: 32.00000 Copy: 636.863 MiB/s
The above results was a good run tho', generally it's closer to the 4.14.151 results.
Linux 5.10.37 (DSA) - performance
AVG Method: MEMCPY Elapsed: 0.04284 MiB: 32.00000 Copy: 747.013 MiB/s
AVG Method: DUMB Elapsed: 0.18988 MiB: 32.00000 Copy: 168.527 MiB/s
AVG Method: MCBLOCK Elapsed: 0.04380 MiB: 32.00000 Copy: 730.529 MiB/s
It really shines here, not sure if it's the kernel change or something you did @ansuel.
3 Likes
Linux 5.10.37 (DSA) - under high cpu load - (iperf3 pumping packets)
AVG Method: MEMCPY Elapsed: 0.06352 MiB: 32.00000 Copy: 503.764 MiB/s
AVG Method: DUMB Elapsed: 0.21935 MiB: 32.00000 Copy: 145.883 MiB/s
AVG Method: MCBLOCK Elapsed: 0.06311 MiB: 32.00000 Copy: 507.028 MiB/s