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[Arista] Disable ATA NCQ for a few products (#13739)
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Why I did it
Some products might experience an occasional IO failure in the communication between CPU and SSD.
Based on some research it could be attributable to some device not handling ATA NCQ (Native Command Queue).

This issue currently affect 4 products:

DCS-7170-32C*
DCS-7170-64C
DCS-7060DX4-32
DCS-7260CX3-64

How I did it
This change disable NCQ on the affected drive for a small set of products.

How to verify it
When the fix is applied, these 2 patterns can be found in the dmesg.
ata1.00: FORCE: horkage modified (noncq)
NCQ (not used)

Test results using: fio --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=64 --runtime=120 --numjobs=4

with NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (depth 32), AA)

   READ: bw=33.9MiB/s (35.6MB/s), 33.9MiB/s-33.9MiB/s (35.6MB/s-35.6MB/s), io=4073MiB (4270MB), run=120078-120078msec
  WRITE: bw=34.1MiB/s (35.8MB/s), 34.1MiB/s-34.1MiB/s (35.8MB/s-35.8MB/s), io=4100MiB (4300MB), run=120078-120078msec
without NCQ (ata1.00: 61865984 sectors, multi 1: LBA48 NCQ (not used))

   READ: bw=31.7MiB/s (33.3MB/s), 31.7MiB/s-31.7MiB/s (33.3MB/s-33.3MB/s), io=3808MiB (3993MB), run=120083-120083msec
  WRITE: bw=31.9MiB/s (33.4MB/s), 31.9MiB/s-31.9MiB/s (33.4MB/s-33.4MB/s), io=3830MiB (4016MB), run=120083-120083msec
Which release branch to backport (provide reason below if selected)
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Staphylo committed Feb 15, 2023
1 parent b0e0b23 commit 5ce1b8e
Showing 1 changed file with 4 additions and 0 deletions.
4 changes: 4 additions & 0 deletions files/Aboot/boot0.j2
Original file line number Diff line number Diff line change
Expand Up @@ -621,6 +621,10 @@ write_platform_specific_cmdline() {
cmdline_add intel_idle.max_cstate=0
read_system_eeprom
fi
if in_array "$platform" "rook"; then
# Currently applies to Alhambra, Blackhawk, Gardena and Mineral
cmdline_add libata.force=1.00:noncq
fi
if in_array "$platform" "crow" "magpie"; then
cmdline_add amd_iommu=off
cmdline_add modprobe.blacklist=snd_hda_intel,hdaudio
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