linux-kernel - Re: [PATCH RFC] [INET]: Get cirtical word in first 64bit of cache line

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Message-ID: <CAOGi=dO2wZESX5o4Jr_XZu0oPM-Qe30DKt-4f_3TVBrVoR=12Q@mail.gmail.com>
Date:	Sun, 2 Dec 2012 21:25:06 +0800
From:	Ling Ma <ling.ma.program@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH RFC] [INET]: Get cirtical word in first 64bit of cache line

Hi Eric,

Attached benchmark test-cwf.c(cc -o test-cwf test-cwf.c), the result
shows when last level cache(LLC) miss and CPU fetches data from
memory, critical word as first 64bit member in cache line has better
performance(costs 158290336 cycles ) than other positions(offset 0x10,
costs 164100732 ) in cache line, the performance is improved by 3.6%
in this case.
cpu-info is also involved too.

Thanks
Ling

View attachment "test-cwf.c" of type "text/x-csrc" (1986 bytes)

Download attachment "cpu-info" of type "application/octet-stream" (7050 bytes)