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From: Badari Pulavarty <pbadari@us.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: suparna@in.ibm.com, linux-kernel@vger.kernel.org, linux-aio@kvack.org
Subject: Re: [PATCH][2.6-mm] Readahead issues and AIO read speedup
Date: Thu, 7 Aug 2003 13:41:50 -0700	[thread overview]
Message-ID: <200308071341.50834.pbadari@us.ibm.com> (raw)
In-Reply-To: <20030807103930.69e497a7.akpm@osdl.org>

On Thursday 07 August 2003 10:39 am, Andrew Morton wrote:
> Badari Pulavarty <pbadari@us.ibm.com> wrote:
> > We should do readahead of actual pages required by the current
> > read would be correct solution. (like Suparna suggested).
>
> I repeat: what will be the effect of this if all those pages are already in
> pagecache?

Hmm !! Do you think just peeking at pagecache and bailing out if
nothing needed to be done, is too expensive ? Anyway, slow read
code has to do this later. Doing it in readahead one more time causes
significant perf. hit ? And also, do you think this is the most common
case ?


Thanks,
Badari

  reply	other threads:[~2003-08-07 20:52 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-07 10:01 [PATCH][2.6-mm] Readahead issues and AIO read speedup Suparna Bhattacharya
2003-08-07 16:01 ` Badari Pulavarty
2003-08-07 16:28   ` Andrew Morton
2003-08-07 17:21     ` Badari Pulavarty
2003-08-07 17:39       ` Andrew Morton
2003-08-07 20:41         ` Badari Pulavarty [this message]
2003-08-07 20:58           ` Andrew Morton
2003-08-08 13:56             ` Suparna Bhattacharya
2003-08-13 21:06               ` Ram Pai
2003-09-23  0:41             ` Ram Pai
2003-08-07 19:36     ` Joel Becker
2003-08-08  5:42       ` Jens Axboe

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