From: Jason Wang <jasowang@redhat.com>
To: Dmitry Fleytman <dmitry@daynix.com>, Ladi Prosek <lprosek@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] net: optimize checksum computation
Date: Mon, 9 Jan 2017 11:32:48 +0800 [thread overview]
Message-ID: <c9214859-d672-5f13-3d01-09325204c6bb@redhat.com> (raw)
In-Reply-To: <F68AE366-F432-43FA-BBD8-6B4EF72BDC14@daynix.com>
On 2017年01月08日 17:03, Dmitry Fleytman wrote:
>> On 6 Jan 2017, at 10:08 AM, Ladi Prosek <lprosek@redhat.com> wrote:
>>
>> Very simple loop optimization with a significant performance impact.
>>
>> Microbenchmark results, modern x86-64:
>>
>> buffer size | speed up
>> ------------+---------
>> 1500 | 1.7x
>> 64 | 1.5x
>> 8 | 1.15x
>>
>> Microbenchmark results, POWER7:
>>
>> buffer size | speed up
>> ------------+---------
>> 1500 | 5x
>> 64 | 3.3x
>> 8 | 1.13x
>>
>> There is a lot of room for further improvement at the expense of
>> code complexity - aligned multibyte reads, LE/BE considerations,
>> architecture-specific optimizations, etc. This patch still keeps
>> things simple and readable.
> Reviewed-by: Dmitry Fleytman <dmitry@daynix.com>
>
Applied to -net.
Thanks
prev parent reply other threads:[~2017-01-09 3:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-06 8:08 [Qemu-devel] [PATCH] net: optimize checksum computation Ladi Prosek
2017-01-08 9:03 ` Dmitry Fleytman
2017-01-09 3:32 ` Jason Wang [this message]
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