From: Eric Blake <eblake@redhat.com>
To: Liang Li <liang.z.li@intel.com>, qemu-devel@nongnu.org
Cc: amit.shah@redhat.com, pbonzini@redhat.com, mst@redhat.com,
quintela@redhat.com
Subject: Re: [Qemu-devel] [v2 0/2] add avx2 instruction optimization
Date: Mon, 9 Nov 2015 20:43:00 -0700 [thread overview]
Message-ID: <564167C4.2060702@redhat.com> (raw)
In-Reply-To: <1447123907-26750-1-git-send-email-liang.z.li@intel.com>
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On 11/09/2015 07:51 PM, Liang Li wrote:
> buffer_find_nonzero_offset() is a hot function during live migration.
> Now it use SSE2 intructions for optimization. For platform supports
> AVX2 instructions, use the AVX2 instructions for optimization can help
> to improve the performance about 30% comparing to SSE2.
Rather than trying to cater to multiple assembly instruction
implementations ourselves, have you tried taking the ideas in this
earlier thread?
https://lists.gnu.org/archive/html/qemu-devel/2015-10/msg05298.html
Ideally, libc's memcmp() will already be using the most efficient
assembly instructions without us having to reproduce the work of picking
the instructions that work best.
--
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:[~2015-11-10 3:43 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-10 2:51 [Qemu-devel] [v2 0/2] add avx2 instruction optimization Liang Li
2015-11-10 2:51 ` [Qemu-devel] [v2 1/2] cutils: " Liang Li
2015-11-12 10:08 ` Paolo Bonzini
2015-11-12 10:12 ` Li, Liang Z
2015-11-12 11:30 ` Juan Quintela
2015-11-13 2:49 ` Li, Liang Z
2015-11-13 9:30 ` Paolo Bonzini
2015-11-12 14:43 ` Richard Henderson
2015-11-10 2:51 ` [Qemu-devel] [v2 2/2] configure: add options to config avx2 Liang Li
2015-11-10 3:43 ` Eric Blake [this message]
2015-11-10 5:48 ` [Qemu-devel] [v2 0/2] add avx2 instruction optimization Li, Liang Z
2015-11-10 9:13 ` Juan Quintela
2015-11-10 9:26 ` Li, Liang Z
2015-11-10 9:35 ` Paolo Bonzini
2015-11-10 9:41 ` Li, Liang Z
2015-11-10 9:50 ` Paolo Bonzini
2015-11-10 9:56 ` Li, Liang Z
2015-11-10 10:00 ` Paolo Bonzini
2015-11-10 10:04 ` Li, Liang Z
2015-11-12 2:49 ` Li, Liang Z
2015-11-12 8:43 ` Paolo Bonzini
2015-11-12 8:53 ` Li, Liang Z
2015-11-12 9:04 ` Paolo Bonzini
2015-11-12 9:40 ` Li, Liang Z
2015-11-12 9:45 ` Paolo Bonzini
2015-11-12 9:53 ` Li, Liang Z
2015-11-12 11:34 ` Juan Quintela
2015-11-12 11:42 ` Li, Liang Z
2015-11-12 19:56 ` Dr. David Alan Gilbert
2015-11-12 20:20 ` Eric Blake
2016-04-07 11:09 ` Dr. David Alan Gilbert
2016-04-07 12:54 ` Michael S. Tsirkin
2016-04-07 13:42 ` Dr. David Alan Gilbert
2016-04-07 13:54 ` Paolo Bonzini
2015-11-10 9:30 ` Paolo Bonzini
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