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SubjectRe: PROBLEM: Tyan s2822 and SATA slowness / erratic speeds kernel 2.6
Date

We experience the same issue when using an LSI SATA controller and the Tyan
motherboard. In addition we did try vanilla 2.6.14.2 and experienced the
same slowdown issues.

-asher

<BLOCKQUOTE style='PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #A0C6E5
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From: <i>Tejun Heo &lt;htejun@gmail.com&gt;</i><br>To: <i>Jones Joneser
&lt;joneserstein@hotmail.com&gt;</i><br>CC: <i>linux-ide@vger.kernel.org,
linux-scsi@vger.kernel.org,linux-kernel@vger.kernel.org</i><br>Subject:
<i>Re: PROBLEM: Tyan s2822 and SATA slowness / erratic speeds kernel
2.6</i><br>Date: <i>Wed, 16 Nov 2005 13:57:02 +0900</i><br>MIME-Version:
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DC824184063;Wed, 16 Nov 2005 13:57:02 +0900 (KST)</i><br>&gt;Jones Joneser
wrote:<br>&gt; &gt; Machine:<br>&gt; &gt; Tyan s2822G3NR-D<br>&gt; &gt;
Silicon Image, Inc. SiI 3114<br>&gt; &gt; SATA Drives: Western Digital 300gb
/ seagate 80 gb<br>&gt; &gt;<br>&gt; &gt; Initially we thought we had a
network issue because we were seeing a<br>&gt; &gt; slowdown when
transferring files &gt; 512Mb in size (by whatever method:<br>&gt; &gt;
rsync, cp, scp, etc.) between two of the Tyan servers, we see the
first<br>&gt; &gt; 512Mb go at a decent rate (tens of megabytes per second)
and then the<br>&gt; &gt; rate plummets to below 500k/sec. However we
reproduce the issue<br>&gt; &gt; locally on a machine thus eliminating the
network card issue. We also<br>&gt; &gt; had tried with different ethernet
cards and x-over cable.<br>&gt; &gt;<br>&gt; &gt;<br>&gt; &gt; We are using
CentOS 4 and have tried both 4.1 and 4.2 (the latest<br>&gt; &gt; edition)
64 and 32 bit. We have tried ubuntu, gentoo, and vanilla<br>&gt; &gt;
kernels. We have upgraded our BIOS to the latest and experimented
with<br>&gt; &gt; different BIOS settings (from 'safe' to 'optimal' with
many variants in<br>&gt; &gt; between.) We have tried it with ACPI switched
off, with 4gb of RAM and<br>&gt; &gt; with 8gb of RAM. We have upgraded the
BIOS to 3.04 &amp; then 3.05. The<br>&gt; &gt; best we get is that under
the ubuntu, gentoo, and a 2.4 kernel we can<br>&gt; &gt; see stable
performance that is well below what we should be getting<br>&gt; &gt;
~20MiB/s.<br>&gt; &gt;<br>&gt; &gt; No matter what combination of
configuration we try, we consistently see<br>&gt; &gt; this issue. We have
even tried and LSI SATA controller w/ Tyan<br>&gt; &gt; motherboard and
experienced the same issues.<br>&gt; &gt;<br>&gt; &gt; We moved the SATA
controller to a Dell PE 1750 and experience none of<br>&gt; &gt; the
slowdowns, consistent ly 45-50MiB/s performance with no erraticness<br>&gt;
&gt; in speed or drops in performance.<br>&gt; &gt;<br>&gt; &gt; We suspect
the issue is related to the combo of the Tyan mobo with the<br>&gt; &gt;
SATA controller subsystem but need some assistance in further
nailing<br>&gt; &gt; down the cause and solution to this issue.<br>&gt;
&gt;<br>&gt; &gt; Let me know of any additional information that I can
provide to assist<br>&gt; &gt; with the debugging of this issue.<br>&gt;
&gt;<br>&gt; &gt; Thanks,<br>&gt; &gt; -asher<br>&gt; &gt;<br>&gt;<br>&gt;i.
posting boot message would help.<br>&gt;ii. Can you try vanilla 2.6.14
kernel? If it's sil m15w problem and<br>&gt;your card is 3114 but not 3112,
the problem should disappear on
2.6.14.<br>&gt;<br>&gt;--<br>&gt;tejun<br>&gt;-<br>&gt;To unsubscribe from
this list: send the line &quot;unsubscribe linux-scsi&quot; in<br>&gt;the
body of a message to majordomo@vger.kernel.org<br>&gt;More majordomo info at
http://vger.kernel.org/majordomo-info.html<br></font></BLOCKQUOTE>


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