From: Eric Piel <Eric.Piel@tremplin-utc.net>
To: linux-os@analogic.com
Cc: quade <quade@hsnr.de>, linux-kernel@vger.kernel.org
Subject: Re: latency error (~2ms) with nanosleep
Date: Mon, 13 Jun 2005 16:27:49 +0200 [thread overview]
Message-ID: <42AD97E5.10600@tremplin-utc.net> (raw)
In-Reply-To: <Pine.LNX.4.61.0506131011370.16830@chaos.analogic.com>
06/13/2005 04:21 PM, Richard B. Johnson wrote/a écrit:
>
> nanosleep, according to the documation is supposed to sleep
> "at least" the 'struct timespec' time. It can return in
> a shorter time as a result of a signal and, if so, the
> input time-values will be updated accordingly. The resolution
> is limited to the HZ value. This means that it will, unless
> interrupted, always sleep at least 1 / HZ seconds (about 1 ms
> on current x86 distributions).
>
> FYI, there is no 'fine resolution' timer available on any
> Linux-ported platform that could take advantage of the nanosecond
> input resolution of the function.
>
I could add that there is a project working on this issue:
high-resolution timers . You can download patches for 2.6 and 2.4 . The
precision is in the order of 10 or 100 µs.
Eric
next prev parent reply other threads:[~2005-06-13 14:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-13 13:30 latency error (~2ms) with nanosleep quade
2005-06-13 14:21 ` Richard B. Johnson
2005-06-13 14:27 ` Eric Piel [this message]
2005-06-13 16:48 ` Chris Friesen
2005-06-13 16:54 ` Nish Aravamudan
2005-06-14 8:57 ` quade
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