Date: Tue, 5 Aug 2003 10:25:24 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Robert Watson <rwatson@freebsd.org> Subject: Re: headsup: swap_pager.c Message-ID: <20030805005524.GS95375@wantadilla.lemis.com> In-Reply-To: <5893.1059721578@critter.freebsd.dk> References: <Pine.NEB.3.96L.1030731190517.85739A-100000@fledge.watson.org> <5893.1059721578@critter.freebsd.dk>
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--bwzj1gAJAu3Kv4S1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Friday, 1 August 2003 at 9:06:18 +0200, Poul-Henning Kamp wrote: > In message <Pine.NEB.3.96L.1030731190517.85739A-100000@fledge.watson.org>, Robe > rt Watson writes: >> >> On Thu, 31 Jul 2003, Poul-Henning Kamp wrote: >> >>> I am in the process of changing the on-disk layout policy used by the >>> swap_pager. >> >> Do you anticipate any performance changes as a result of this change? > > Anticipate ? No. > Be surprised by improvements ? No. > > The striping code limits the I/O size for paging activity to a small > size. By laying out each disk sequentially in the "swap device" we > can increase that size to what our I/O system can lift. I'd expect a significant improvement. In our environment, throughput is almost linearly related to request size, so anything to increase the transfer size should improve the situation. Greg -- See complete headers for address and phone numbers --bwzj1gAJAu3Kv4S1 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE/LwB8IubykFB6QiMRAu7zAKCQUYSG3oykG3OSzxgqNCd0MJwMRQCgl3zF c8S+h2Dw2BAcDbGz0XIj/Eg= =l0nw -----END PGP SIGNATURE----- --bwzj1gAJAu3Kv4S1--
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