[CentOS-devel] Kernel bug fix that restores SSD performance -- testing sought

Akemi Yagi amyagi at gmail.com
Sun Jul 14 18:49:31 UTC 2013


According to this bug report:

http://bugs.centos.org/view.php?id=6548
(originally from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=642729 )

a patch introduced in kernel 2.6.32 causes a performance drop in
[certain] SSDs. This patch was later reverted in the mainline kernel.
With this kernel, the reporter says, the SSD performance is now what
is expected from the spec.

I have built a centosplus kernel that has the referenced patch
reverted. My limited test (using hdparm) did show some improvement
with this kernel. kernel-ml from ELRepo (currently at 3.10.0-1.el6)
gave a number similar to this plus kernel.

http://people.centos.org/toracat/kernel/6/plus/bug6548/

Please test if you can and report back with your findings (good, bad,
no diff ...). Note that the packages are not signed and are provided
for testing purposes only.

Thanks in advance for your input.

Akemi / toracat


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