Does OpenWrt kernel has TRIM issue patch for Samsung SSD 850 Pro?

Mitchell · November 8, 2018, 8:24am

Hi.

Once Linux kernel has problem for Samsung SSD 850 Pro which TRIM bug.

Does OpenWrt has the fix for now?
If I use Samsung SSD 850 Pro as external storage device (ext4 format mount),
none of issue I can expect?

Please advice me.

Thank you in advance.

jow · November 8, 2018, 8:38am

OpenWrt does not carry SSD specific patches, so it only has this fix if it is present in the upstream 4.9 and 4.14 kernels.

LGA1150 · November 8, 2018, 8:55am

First off, your SSD trim bug should be fixed by a new firmware, but not the Linux kernel.
And unfortunately even the latest 4.19 kernel source still blacklists Samsung 850 trim

github.com

torvalds/linux/blob/v4.19/drivers/ata/libata-core.c#L4572


	{ "Crucial_CT*M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "Micron_M5[15]0_*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "Crucial_CT*M550*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "Crucial_CT*MX100*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "Samsung SSD 840*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "Samsung SSD 850*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },
	{ "FCCT*M500*",			NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
						ATA_HORKAGE_ZERO_AFTER_TRIM, },


	/* devices that don't properly handle TRIM commands */
	{ "SuperSSpeed S238*",		NULL,	ATA_HORKAGE_NOTRIM, },


	/*
	 * As defined, the DRAT (Deterministic Read After Trim) and RZAT
	 * (Return Zero After Trim) flags in the ATA Command Set are

You can try removing it from the blacklist anyway though, at the risk of data loss.

Mitchell · November 8, 2018, 12:59pm

Thanks for the reply.

Then...the Samsung SSD 860 EVO should not be the problem, right?