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From: "Francis Moreau" <francis.moro@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: jens.axboe@oracle.com
Subject: question about splice performance
Date: Sun, 25 May 2008 17:12:06 +0200	[thread overview]
Message-ID: <38b2ab8a0805250812l2ecd424bh74a1694ed56460de@mail.gmail.com> (raw)

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

             reply	other threads:[~2008-05-25 15:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-25 15:12 Francis Moreau [this message]
2008-05-25 15:40 ` Jan Engelhardt
2008-05-25 17:22 ` Sitsofe Wheeler
2008-05-25 20:47 ` Jeff Garzik
2008-05-26  8:57   ` Francis Moreau
2008-05-26  9:06     ` Bernd Petrovitsch

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