From: David Greaves <david@dgreaves.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] LVM2 seems to chop performance by 33%
Date: Mon, 21 Jun 2004 10:55:54 +0100 [thread overview]
Message-ID: <40D6B0AA.4030700@dgreaves.com> (raw)
In-Reply-To: <20040620195316.GT6302@agk.surrey.redhat.com>
Alasdair G Kergon wrote:
>On Sun, Jun 20, 2004 at 07:17:58PM +0100, David Greaves wrote:
>
>
>>No-one ever replied as to why blockdev --setra / --getra is not the same
>>as that displayed in lvdisplay
>>And it's not documented that I can find. There's a comment: "Not used by
>>device-mapper." And that means.....?
>>
>>
>
>Any LVM read ahead setting is ignored by LVM2 i.e. not passed to the kernel.
>
>If it's demonstrated to be useful it could still be implemented, but
>the current development priorities are still correctness and new features
>rather than performance.
>
>Alasdair
>
>
Thanks Alasdair
It would be good to modify the docs to be clearer and maybe say "use
blockdev --setra"
David
next prev parent reply other threads:[~2004-06-21 9:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-10 14:25 [linux-lvm] LVM2 seems to chop performance by 33% David Greaves
2004-06-10 15:05 ` Stuart Harper
2004-06-10 15:31 ` Chris Croswhite
2004-06-10 15:34 ` David Greaves
2004-06-10 16:30 ` Clint Byrum
2004-06-20 18:17 ` David Greaves
2004-06-20 19:53 ` Alasdair G Kergon
2004-06-21 9:55 ` David Greaves [this message]
2004-06-14 11:50 ` Miguel Cabeça
2004-06-14 13:24 ` David Greaves
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