linux-kernel - Re: slow nanosleep?

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Message-ID: <OF2B75FA7C.7064BC41-ONC1257798.00318FDA-C1257798.00329AEF@transmode.se>
Date:	Wed, 8 Sep 2010 11:12:44 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: slow nanosleep?

Eric Dumazet <eric.dumazet@...il.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@...alhost ~ # ./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

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