From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: pbadari@us.ibm.com (Badari Pulavarty)
Cc: linux-kernel@vger.kernel.org, marcelo@conectiva.com.br,
andrea@suse.de, pbadari@us.ibm.com
Subject: Re: [PATCH] PAGE_SIZE IO for RAW (RAW VARY)
Date: Wed, 9 Jan 2002 22:56:44 +0000 (GMT) [thread overview]
Message-ID: <E16OReG-0002Zi-00@the-village.bc.nu> (raw)
In-Reply-To: <200201091741.g09HfAI17240@eng2.beaverton.ibm.com> from "Badari Pulavarty" at Jan 09, 2002 09:41:10 AM
> Here is a 2.4.17 patch for doing PAGE_SIZE IO on raw devices. Instead
> of doing 512 byte buffer heads, the patch does 4K buffer heads. This
> patch significantly reduced CPU overhead and increased IO throughput
> in our database benchmark runs. (CPU went from 45% busy to 6% busy).
Does that work out when the application is still doing 512 byte raw I/O.
Its fine to fall back to the current performance but at least one very
large competing database would get quite irate if the fallback made
512 byte mode slower or nonfunctional ?
Alan
next prev parent reply other threads:[~2002-01-09 22:45 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-09 17:41 Badari Pulavarty
2002-01-09 17:58 ` Benjamin LaHaise
2002-01-09 18:12 ` Badari Pulavarty
2002-01-09 18:21 ` Benjamin LaHaise
2002-01-09 19:28 ` Badari Pulavarty
2002-01-09 19:49 ` Benjamin LaHaise
2002-01-09 22:58 ` Alan Cox
2002-01-09 23:48 ` Badari Pulavarty
2002-01-10 10:34 ` Andrea Arcangeli
2002-01-10 10:29 ` Andrea Arcangeli
2002-01-10 10:18 ` Andrea Arcangeli
2002-01-10 10:22 ` Jens Axboe
2002-01-10 10:47 ` Andrea Arcangeli
2002-01-10 10:51 ` Jens Axboe
2002-01-10 11:09 ` Andrea Arcangeli
2002-01-10 16:58 ` Badari Pulavarty
2002-01-11 13:52 ` Andrea Arcangeli
2002-01-10 19:24 ` Badari Pulavarty
2002-01-10 20:00 ` Alan Cox
2002-01-10 21:03 ` Badari Pulavarty
2002-01-10 21:26 ` Alan Cox
2002-01-10 21:15 ` Badari Pulavarty
2002-01-15 3:16 ` Joel Becker
2002-01-10 7:12 ` Jens Axboe
2002-01-09 18:13 ` Jens Axboe
2002-01-09 22:56 ` Alan Cox [this message]
2002-01-09 23:20 ` Badari Pulavarty
2002-01-10 0:23 ` Alan Cox
2002-01-10 4:06 ` GOTO Masanori
[not found] <200201091741.g09HfAI17240@eng2.beaverton.ibm.com.suse.lists.linux.kernel>
[not found] ` <20020109125845.B12609@redhat.com.suse.lists.linux.kernel>
2002-01-09 18:15 ` Andi Kleen
[not found] <200201102153.g0ALrl402482@eng2.beaverton.ibm.com>
2002-01-10 22:11 ` Alan Cox
2002-01-10 22:20 ` Badari Pulavarty
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