From: Chris Friesen <cfriesen@nortel.com>
To: quade <quade@hsnr.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: latency error (~2ms) with nanosleep
Date: Mon, 13 Jun 2005 10:48:17 -0600 [thread overview]
Message-ID: <42ADB8D1.9090503@nortel.com> (raw)
In-Reply-To: <20050613133047.GA11979@hsnr.de>
quade wrote:
> Playing around with the (simple) measurement of latency-times
> I noticed, that the systemcall "nanosleep" has always a minimal
> latency from about ~2ms (haven't run it all night, so...). It
> seems to be a systematical error.
Known issue. The x86 interrupt usually has a period of slightly less
than a ms. It will therefore generally add nearly a whole ms to ensure
that it does not ever wait for *less* than specified.
Chris
next prev parent reply other threads:[~2005-06-13 16:48 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
2005-06-13 16:48 ` Chris Friesen [this message]
2005-06-13 16:54 ` Nish Aravamudan
2005-06-14 8:57 ` quade
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