From: Arjan van de Ven <arjanv@redhat.com>
To: Ben Greear <greearb@candelatech.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: select returning slow on RH 2.4.18-14 (RH 8.0) kernel.
Date: 13 Feb 2003 12:39:00 +0100 [thread overview]
Message-ID: <1045136340.2313.1.camel@laptop.fenrus.com> (raw)
In-Reply-To: <3E4B60A1.2060209@candelatech.com>
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On Thu, 2003-02-13 at 10:08, Ben Greear wrote:
> I've been doing some testing with RH 8.0 on an Ezra 800Mhz
> machine.
>
> Even when lightly loaded select() often returns 3-9 miliseconds slower
> than the timeout would suggest. I know select is not guaranteed to
> return with < 10ms accuracy, but with almost no load, shouldn't it
> at least return with 1ms accuracy on average?
no
the kernel.org kernels will return in multiple-of-10ms quantities due to
HZ having the value of 100.
2.4.18-14 (which is btw obsoleted by several security errata) has a HZ
value of 512 so will return in shorter quantities, EXCEPT when you
always try to wait exactly 10ms of course....
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next prev parent reply other threads:[~2003-02-13 11:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-13 9:08 select returning slow on RH 2.4.18-14 (RH 8.0) kernel Ben Greear
2003-02-13 11:39 ` Arjan van de Ven [this message]
2003-02-13 21:27 ` Ben Greear
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