* Re: ahci slow transfer rate with kernel 2.6.23-2.6.25
[not found] <9359bbd70804280211ta587f87sff83dba5f7974796@mail.gmail.com>
@ 2008-04-28 14:45 ` kyle
0 siblings, 0 replies; only message in thread
From: kyle @ 2008-04-28 14:45 UTC (permalink / raw)
To: linux-raid; +Cc: Sergey A. Sukiyazov, kyle
Ok, I'll try set queue_depth to 1 to see if there's any improvement. btw,
the same disk connected to sil3132 controller has no problem at all with
queue_depth = 31, I got over 100MB/s for hdparm, dd, etc test with
ST3500320AS + sil3132. So I assume the problem would be ahci.
Thanks a lot.
----- Original Message -----
From: Sergey A. Sukiyazov
To: kylewong@southa.com
Sent: Monday, April 28, 2008 5:11 PM
Subject: Re: ahci slow transfer rate with kernel 2.6.23-2.6.25
Hi
I have some problem. Try set queue_depth in "1" for disks, it disables NCQ
and the transfer rate
has returned to 100MB/S. It's ST3500320AS problem with NCQ implementation (I
think :-))
for i in sda sdb sdd sdf ; do
echo "1" > /sys/block/${i}/device/queue_depth
done
See also: http://bugzilla.kernel.org/show_bug.cgi?id=8327
--
Best regards
Sergey A. Sukiyazov
http://corwin.rostovlinux.ru/
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