From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: slow nanosleep?
Date: Wed, 8 Sep 2010 11:12:44 +0200 [thread overview]
Message-ID: <OF2B75FA7C.7064BC41-ONC1257798.00318FDA-C1257798.00329AEF@transmode.se> (raw)
In-Reply-To: <1283934289.2880.12.camel@edumazet-laptop>
Eric Dumazet <eric.dumazet@gmail.com> wrote on 2010/09/08 10:24:49:
>
> Le mercredi 08 septembre 2010 à 10:04 +0200, Joakim Tjernlund a écrit :
>
> > That makes litte difference:
> > root@localhost ~ # ./nanosleep
> > nanosleep
> > req:0 :0
> > tv_res:0 :112
> >
>
> Here, result is 30 (with prctl())
> instead of 95 (without)
On x86 I notice a difference:
7 vs 57.
however select is still faster: 2
The system call OH seems to be bigger for nanosleep than
for select and on my ppc is is about 112 us. Can anything
be done about that?
Jocke
next prev parent reply other threads:[~2010-09-08 9:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-08 7:45 slow nanosleep? Joakim Tjernlund
2010-09-08 7:56 ` Eric Dumazet
2010-09-08 8:04 ` Joakim Tjernlund
2010-09-08 8:24 ` Eric Dumazet
2010-09-08 9:12 ` Joakim Tjernlund [this message]
2010-09-08 9:51 ` Thomas Gleixner
2010-09-08 10:14 ` Eric Dumazet
2010-09-08 10:17 ` Thomas Gleixner
2010-09-08 12:11 ` Joakim Tjernlund
2010-09-08 12:43 ` Thomas Gleixner
2010-09-08 13:00 ` Peter Zijlstra
2010-09-08 13:44 ` Joakim Tjernlund
2010-09-08 13:51 ` Peter Zijlstra
2010-09-08 13:52 ` Thomas Gleixner
2010-09-08 14:19 ` Joakim Tjernlund
2010-09-08 14:30 ` Thomas Gleixner
2010-09-08 14:33 ` Joakim Tjernlund
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