From: Jens Axboe <axboe@suse.de>
To: "Catalin(ux aka Dino) BOIE" <util@deuroconsult.ro>
Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: Strange vmstat output. 2.6.10 Scheduler?
Date: Tue, 1 Feb 2005 11:26:38 +0100 [thread overview]
Message-ID: <20050201102638.GJ4137@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.62.0502011217320.26221@webhosting.rdsbv.ro>
On Tue, Feb 01 2005, Catalin(ux aka Dino) BOIE wrote:
> Hello!
>
> I have a weird problem with a server. I use deadline.
> The output of vmstat is:
> 1 1 12312 6064 7580 815432 0 0 5332 456 1263 3119 22 5 0
> 73
> 0 1 12312 5280 7584 816240 0 0 6204 620 1307 1530 15 4 0
> 81
> 0 1 12312 6096 7528 815088 0 0 7604 8732 1256 1398 5 8 0
> 87
> 0 1 12312 6048 7528 815144 0 0 8 8 1243 1440 14 2 0
> 84
> 0 1 12312 6048 7528 815168 0 0 0 0 1261 1287 8 2 0
> 90
> 0 2 12312 6040 7584 815184 0 0 0 0 1258 1197 7 2 0
> 91
> 0 2 12312 6024 7584 815208 0 0 0 0 1265 1309 6 5 0
> 89
> 0 2 12312 6024 7584 815208 0 0 0 136 1253 365 2 2 0
> 96
> 0 2 12312 5984 7584 815208 0 0 0 0 1268 413 2 1 0
> 97
> 0 2 12312 6052 7584 815208 0 0 0 0 1270 375 2 1 0
> 97
> 1 0 12312 6164 7584 815156 0 0 6188 288 1270 4314 23 5 0
> 72
> 0 1 12312 5684 7536 815592 0 0 4128 8656 1270 1316 14 3 0
> 83
> 0 1 12312 5684 7536 815608 0 0 0 0 1258 1251 8 3 0
> 89
> 0 1 12312 5552 7536 815628 0 0 0 0 1258 1327 8 2 0
> 90
> 0 1 12312 5552 7536 815644 0 0 0 0 1264 1127 7 2 0
> 91
> 0 1 12312 5552 7536 815668 0 0 0 2 1258 1225 8 3 0
> 89
> 0 3 12312 5248 7588 816108 0 0 4340 585 1249 1316 7 3 0
> 90
> 0 2 12312 5612 7584 815680 0 0 3092 188 1254 411 3 1 0
> 96
> 0 2 12312 5564 7584 815676 0 0 0 0 1261 259 2 2 0
> 96
> 0 2 12312 5564 7584 815676 0 0 0 0 1254 348 2 1 0
> 97
>
> It seems strange because iowait is at 90% but nothing is trasnfered
> to/from disk. Why is that?
The bi/bo numbers are sometimes a little confusing, it doesn't mean that
the drive is actually doing 8656kb of io at that very second - only that
this much io was queued to the drive.
> I run postgresql on this server and I'm not satistied by it's speed.
>
> Single Pentium IV, IDE disk.
>
> What can be the problem?
Do you have write cache enabled on the drive?
--
Jens Axboe
next prev parent reply other threads:[~2005-02-01 10:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-01 10:21 Strange vmstat output. 2.6.10 Scheduler? Catalin(ux aka Dino) BOIE
2005-02-01 10:26 ` Jens Axboe [this message]
2005-02-01 10:36 ` Catalin(ux aka Dino) BOIE
2005-02-01 10:42 ` Jens Axboe
2005-02-01 10:46 ` Catalin(ux aka Dino) BOIE
2005-02-01 10:49 ` Jens Axboe
2005-02-01 10:54 ` Catalin(ux aka Dino) BOIE
2005-02-01 10:59 ` Catalin(ux aka Dino) BOIE
2005-02-01 10:34 ` Massimo Cetra
2005-02-01 10:48 ` Catalin(ux aka Dino) BOIE
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