From: Jens Axboe <axboe@suse.de>
To: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: Vojtech Pavlik <vojtech@suse.cz>,
linux-raid <linux-raid@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Where is the performance bottleneck?
Date: Wed, 31 Aug 2005 19:35:26 +0200 [thread overview]
Message-ID: <20050831173525.GJ4018@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.61.0508311648390.16574@diagnostix.dwd.de>
On Wed, Aug 31 2005, Holger Kiehl wrote:
> ># ./oread /dev/sdX
> >
> >and it will read 128k chunks direct from that device. Run on the same
> >drives as above, reply with the vmstat info again.
> >
> Using kernel 2.6.12.5 again, here the results:
[snip]
Ok, reads as expected, like the buffered io but using less system time.
And you are still 1/3 off the target data rate, hmmm...
With the reads, how does the aggregate bandwidth look when you add
'clients'? Same as with writes, gradually decreasing per-device
throughput?
--
Jens Axboe
next prev parent reply other threads:[~2005-08-31 17:35 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-29 18:20 Where is the performance bottleneck? Holger Kiehl
2005-08-29 19:54 ` Mark Hahn
2005-08-30 19:08 ` Holger Kiehl
2005-08-30 23:05 ` Guy
2005-09-28 20:04 ` Bill Davidsen
2005-09-30 4:52 ` Guy
2005-09-30 5:19 ` dean gaudet
2005-10-06 21:15 ` Bill Davidsen
2005-08-29 20:10 ` Al Boldi
2005-08-30 19:18 ` Holger Kiehl
2005-08-31 10:30 ` Al Boldi
2005-08-29 20:25 ` Vojtech Pavlik
2005-08-30 20:06 ` Holger Kiehl
2005-08-31 7:11 ` Vojtech Pavlik
2005-08-31 7:26 ` Jens Axboe
2005-08-31 11:54 ` Holger Kiehl
2005-08-31 12:07 ` Jens Axboe
2005-08-31 13:55 ` Holger Kiehl
2005-08-31 14:24 ` Dr. David Alan Gilbert
2005-08-31 20:56 ` Holger Kiehl
2005-08-31 21:16 ` Dr. David Alan Gilbert
2005-08-31 16:20 ` Jens Axboe
2005-08-31 15:16 ` jmerkey
2005-08-31 16:58 ` Tom Callahan
2005-08-31 16:58 ` Tom Callahan
2005-08-31 15:47 ` jmerkey
2005-08-31 17:11 ` Jens Axboe
2005-08-31 15:59 ` jmerkey
2005-08-31 17:32 ` Jens Axboe
2005-08-31 16:51 ` Holger Kiehl
2005-08-31 17:35 ` Jens Axboe [this message]
2005-08-31 19:00 ` Holger Kiehl
2005-08-31 18:06 ` Michael Tokarev
2005-08-31 18:52 ` Ming Zhang
2005-08-31 18:57 ` Ming Zhang
2005-08-31 12:24 ` Nick Piggin
2005-08-31 16:25 ` Holger Kiehl
2005-08-31 17:25 ` Nick Piggin
2005-08-31 21:57 ` Holger Kiehl
2005-09-01 9:12 ` Holger Kiehl
2005-09-02 14:28 ` Al Boldi
2005-08-31 13:38 ` Holger Kiehl
2005-08-29 23:09 ` Peter Chubb
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