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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=42ADB8D1.9090503@nortel.com \
--to=cfriesen@nortel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=quade@hsnr.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.