From: Jan Stancek <jstancek@redhat.com>
To: ltp@lists.linux.it
Subject: [LTP] [PATCH v2] [RFC] pselect01: Tune thresholds
Date: Mon, 15 May 2017 09:00:19 -0400 (EDT) [thread overview]
Message-ID: <1832031935.11522951.1494853219630.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <20170515123556.GA8280@rei.lan>
----- Original Message -----
> Hi!
> > while looking at fs/select.c I noticed that it also takes
> > current->timer_slack_ns into account and uses that if
> > slack is smaller. Would it make sense to add ...?
> > slack_per_scall = MAX(slack_per_scall, prctl(PR_GET_TIMERSLACK) / 1000);
> > The default is 50us, so maybe the 250us in formula covers this already?
>
> I guess that the 50us is included in the 250us already. So what about
> adding the line you sugests and decreasing the 250us to 200us?
We can do that, but looking again at PR_GET_TIMERSLACK, it is supported
since 2.6.28, so we'd need to skip older kernels or fall back to a
default of 50us.
Regards,
Jan
next prev parent reply other threads:[~2017-05-15 13:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-12 14:16 [LTP] [PATCH v2] [RFC] pselect01: Tune thresholds Cyril Hrubis
2017-05-15 10:03 ` Jan Stancek
2017-05-15 10:20 ` Xiao Yang
2017-05-15 13:15 ` Jan Stancek
2017-05-15 13:23 ` Cyril Hrubis
2017-05-15 12:36 ` Cyril Hrubis
2017-05-15 13:00 ` Jan Stancek [this message]
2017-05-15 13:13 ` Cyril Hrubis
2017-05-15 13:16 ` Jan Stancek
2017-05-22 8:39 ` Jan Stancek
2017-05-22 12:04 ` Cyril Hrubis
2017-05-22 13:37 ` Jan Stancek
2017-05-22 13:19 ` Cyril Hrubis
2017-05-22 14:57 ` Jan Stancek
2017-05-22 15:15 ` Cyril Hrubis
2017-05-23 7:54 ` Jan Stancek
2017-05-23 9:16 ` Cyril Hrubis
2017-05-23 9:45 ` Jan Stancek
2017-06-02 12:48 ` Jan Stancek
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