From: Eric Blake <eblake@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: kwolf@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCHv3 4/9] bitops: use vector algorithm to optimize find_next_bit()
Date: Thu, 21 Mar 2013 13:18:55 -0600 [thread overview]
Message-ID: <514B5D1F.9040604@redhat.com> (raw)
In-Reply-To: <1363881457-14814-5-git-send-email-pl@kamp.de>
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On 03/21/2013 09:57 AM, Peter Lieven wrote:
> this patch adds the usage of buffer_find_nonzero_offset()
> to skip large areas of zeroes.
>
> compared to loop unrolling presented in an earlier
> patch this adds another 50% performance benefit for
> skipping large areas of zeroes. loop unrolling alone
> added close to 100% speedup.
>
> Signed-off-by: Peter Lieven <pl@kamp.de>
> ---
> util/bitops.c | 22 +++++++++++++++++++---
> 1 file changed, 19 insertions(+), 3 deletions(-)
Reviewed-by: Eric Blake <eblake@redhat.com>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2013-03-21 19:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-21 15:57 [Qemu-devel] [PATCHv3 0/9] buffer_is_zero / migration optimizations Peter Lieven
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 1/9] move vector definitions to qemu-common.h Peter Lieven
2013-03-21 17:29 ` Eric Blake
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 2/9] cutils: add a function to find non-zero content in a buffer Peter Lieven
2013-03-21 18:12 ` Eric Blake
2013-03-21 19:11 ` Peter Lieven
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 3/9] buffer_is_zero: use vector optimizations if possible Peter Lieven
2013-03-21 18:16 ` Eric Blake
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 4/9] bitops: use vector algorithm to optimize find_next_bit() Peter Lieven
2013-03-21 19:18 ` Eric Blake [this message]
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 5/9] migration: search for zero instead of dup pages Peter Lieven
2013-03-21 19:24 ` Eric Blake
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 6/9] migration: add an indicator for bulk state of ram migration Peter Lieven
2013-03-21 19:27 ` Eric Blake
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 7/9] migration: do not sent zero pages in bulk stage Peter Lieven
2013-03-21 19:26 ` Eric Blake
2013-03-21 19:44 ` Peter Lieven
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 8/9] migration: do not search dirty " Peter Lieven
2013-03-21 19:27 ` Eric Blake
2013-03-21 19:57 ` Peter Lieven
2013-03-21 15:57 ` [Qemu-devel] [PATCHv3 9/9] migration: use XBZRLE only after " Peter Lieven
2013-03-21 19:31 ` Eric Blake
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