From: Petr Sebor <petr@scssoft.com>
To: "J. Ryan Earl" <heretic@clanhk.org>
Cc: linux-ide@vger.kernel.org
Subject: Re: sata_via - too slow
Date: Tue, 03 Aug 2004 00:22:01 +0200 [thread overview]
Message-ID: <410EBE89.9000008@scssoft.com> (raw)
In-Reply-To: <410EC673.1090506@clanhk.org>
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J. Ryan Earl wrote:
> Petr Sebor wrote:
>
>> and it is being worse, I can see frequently, that the 'wait' gets
>> frequently over 90%.
>> I have tried the kernel both in SMP or UP, with noacpi, iommu=off,
>> preemptible kernel or not
>> without difference....
>
>
> Which 86_64.org patches are you using?
None. It is vanilla 2.6.7 kernel with 2.6.8-rc2-bkX patch. I'd try to
patch the kernel with x86_64.org's
stuff, but I thought this applies only if I run the kernel in native -
64bit mode. I haven't gotten that far...
The kernel is compiled with K7 Athlon CPU optimizations, nothing more.
>
>>
>> From what I have understood, these drives are SATA with PATA bridge
>> on them.
>> The problems described happen on both. No difference.
>>
>> Interesting is, that
>> root@opteron:$ hdparm -t /dev/sda
>>
>> /dev/sda:
>> Timing buffered disk reads: 144 MB in 3.03 seconds = 47.45 MB/sec
>>
>> So it is not _that_ slow...
>
>
> I highly doubt it's related to libata or sata_via at all. A high wait
> indicates your processors handle data a lot faster than your
> harddrives can deliver and processes are blocked waiting on I/O, it
> would otherwise be counted as idle time in the 2.4 line; this is
> normal AFAIK. Your performance is nominal, the problem is most likely
> elsewhere.
The more I naively think about it the more I am getting the similar
feeling. I fear I have incorrectly blamed
the sata layer, but I don't remember having similar problems with ide
drives.
> What motherboard is this? The MSI FAR2 whatever?
It is MSI Master2-FAR.. sorry for not mentioning that.
Petr
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next prev parent reply other threads:[~2004-08-02 22:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-02 12:07 sata_via - too slow Petr Sebor
2004-08-02 22:55 ` J. Ryan Earl
2004-08-02 22:22 ` Petr Sebor [this message]
2004-08-07 7:24 ` J. Ryan Earl
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