From: Paolo Bonzini <pbonzini@redhat.com>
To: Charlie Shepherd <charlie@ctshepherd.com>
Cc: kwolf@redhat.com, stefanha@gmail.com, gabriel@kerneis.info,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 0/3] COW: Speed up writes
Date: Wed, 06 Nov 2013 13:45:59 +0100 [thread overview]
Message-ID: <527A3A07.2090207@redhat.com> (raw)
In-Reply-To: <1383740591-27739-1-git-send-email-charlie@ctshepherd.com>
Il 06/11/2013 13:23, Charlie Shepherd ha scritto:
> Patch 2 was written initially I was intending to use cow_co_is_allocated in
> Patch 3 and needed it to consider all sectors but in the end cow_find_streak
> was sufficient, so it may not strictly be necessary.
Patch 2 can still speed up reads that cross a sector boundary from 4 I/O
operations (2 for the bitmap, 2 for the data) to 3 (only 1 for the data).
Paolo
prev parent reply other threads:[~2013-11-06 12:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-06 12:23 [Qemu-devel] [PATCH 0/3] COW: Speed up writes Charlie Shepherd
2013-11-06 12:23 ` [Qemu-devel] [PATCH 1/3] " Charlie Shepherd
2013-11-06 12:26 ` Paolo Bonzini
2013-11-06 12:23 ` [Qemu-devel] [PATCH 2/3] COW: Extend checking allocated bits to beyond one sector Charlie Shepherd
2013-11-06 12:32 ` Paolo Bonzini
2013-11-06 12:23 ` [Qemu-devel] [PATCH 3/3] COW: Skip setting already set bits Charlie Shepherd
2013-11-06 12:29 ` Paolo Bonzini
2013-11-06 12:36 ` Charlie Shepherd
2013-11-06 12:45 ` Paolo Bonzini [this message]
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