From: "J. Ryan Earl" <heretic@clanhk.org>
To: Petr Sebor <petr@scssoft.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: sata_via - too slow
Date: Mon, 02 Aug 2004 16:55:47 -0600 [thread overview]
Message-ID: <410EC673.1090506@clanhk.org> (raw)
In-Reply-To: <410E2E9C.8020606@scssoft.com>
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?
>
> 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.
What motherboard is this? The MSI FAR2 whatever?
-ryan
next prev parent reply other threads:[~2004-08-02 21:55 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 [this message]
2004-08-02 22:22 ` Petr Sebor
2004-08-07 7:24 ` J. Ryan Earl
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