linux-kernel - question about splice performance

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Message-ID: <38b2ab8a0805250812l2ecd424bh74a1694ed56460de@mail.gmail.com>
Date:	Sun, 25 May 2008 17:12:06 +0200
From:	"Francis Moreau" <francis.moro@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	jens.axboe@...cle.com
Subject: question about splice performance

Hi,

I did a really basic benchmark and was suprise about the results.

$ echo 3 > /proc/sys/vm/drop_caches
$ time  splice-cp  vmlinux /tmp/vmlinux

real    0m10.158s
user    0m0.002s
sys     0m0.401s

$ echo 3 > /proc/sys/vm/drop_caches
$ time  cp  vmlinux /tmp/vmlinux

real    0m10.590s
user    0m0.017s
sys     0m0.459s


I was expecting splice-cp case to be faster.

Could someone enlight me ?

Thanks
-- 
Francis
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