From: Andrea Arcangeli <andrea@suse.de>
To: Roger Larsson <roger.larsson@norran.net>
Cc: Robert Love <rml@tech9.net>, Andre Pang <ozone@algorithm.com.au>,
linux-kernel@vger.kernel.org, safemode@speakeasy.net,
Dieter.Nuetzel@hamburg.de, iafilius@xs4all.nl,
ilsensine@inwind.it, george@mvista.com
Subject: Re: ksoftirqd? (Was: Re: [PATCH] Preemption Latency Measurement Tool)
Date: Sat, 22 Sep 2001 15:14:53 +0200 [thread overview]
Message-ID: <20010922151453.B976@athlon.random> (raw)
In-Reply-To: <1000939458.3853.17.camel@phantasy> <1001131036.557760.4340.nullmailer@bozar.algorithm.com.au> <1001139027.1245.28.camel@phantasy> <200109221301.f8MD1n129687@mailc.telia.com>
In-Reply-To: <200109221301.f8MD1n129687@mailc.telia.com>; from roger.larsson@norran.net on Sat, Sep 22, 2001 at 02:56:58PM +0200
On Sat, Sep 22, 2001 at 02:56:58PM +0200, Roger Larsson wrote:
> Hi,
>
> We have a new kid on the block since we started thinking of a preemptive
> kernel.
>
> ksoftirqd...
>
> Running with nice 19 (shouldn't it really be -19?)
> Or have a RT setting? (maybe not since one of the reasons for
> softirqd would be lost - would be scheduled in immediately)
> Can't a high prio or RT process be starved due to missing
> service (bh) after an interrupt?
It cannot be starved, if ksoftirqd is never scheduled the do_softirq()
will be run by the next timer irq or apic_timer irq.
> This will not show up in latency profiling patches since
> the kernel does what is requested...
>
> Previously it was run directly after interrupt,
> before returning to the interrupted process...
It is still the case, that's also the common case actually.
Andrea
next prev parent reply other threads:[~2001-09-22 13:15 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-19 22:44 [PATCH] Preemption Latency Measurement Tool Robert Love
2001-09-20 1:40 ` Ignacio Vazquez-Abrams
2001-09-20 2:23 ` safemode
2001-09-20 1:13 ` David Lang
2001-09-20 2:57 ` Robert Love
2001-09-20 2:38 ` Robert Love
2001-09-20 6:31 ` Dieter Nützel
2001-09-20 6:31 ` Dieter Nützel
2001-09-20 20:27 ` Robert Love
[not found] ` <200109202111.f8KLBgG16833@zero.tech9.net>
2001-09-20 22:09 ` [PATCH] Preemption patch 2.4.9-ac12 Robert Love
[not found] ` <20010920063143.424BD1E41A@Cantor.suse.de>
2001-09-20 6:41 ` [PATCH] Preemption Latency Measurement Tool Andrea Arcangeli
2001-09-20 7:57 ` Dieter Nützel
[not found] ` <20010920075751.6CA791E6B2@Cantor.suse.de>
2001-09-20 8:21 ` Andrea Arcangeli
2001-09-20 20:13 ` george anzinger
2001-09-20 20:38 ` Randy.Dunlap
2001-09-20 21:10 ` Robert Love
2001-09-20 21:35 ` Dieter Nützel
2001-09-20 22:03 ` Oliver Xymoron
2001-09-20 22:51 ` Dieter Nützel
[not found] ` <200109202252.f8KMqLG17327@zero.tech9.net>
2001-09-21 3:17 ` Robert Love
2001-09-21 15:48 ` george anzinger
2001-09-22 21:09 ` Dieter Nützel
2001-09-22 23:40 ` safemode
2001-09-22 23:46 ` Dieter Nützel
2001-09-23 0:15 ` safemode
[not found] ` <200109222340.BAA37547@blipp.internet5.net>
2001-09-23 0:38 ` Roger Larsson
2001-09-23 1:42 ` safemode
2001-09-23 3:02 ` Robert Love
2001-09-23 16:43 ` Roger Larsson
2001-09-23 0:42 ` Dieter Nützel
[not found] ` <200109222341.f8MNfnG25152@zero.tech9.net>
2001-09-23 2:50 ` Robert Love
2001-09-23 3:14 ` george anzinger
2001-09-23 4:06 ` Dieter Nützel
[not found] ` <200109222347.f8MNlMG25157@zero.tech9.net>
2001-09-23 2:54 ` Robert Love
2001-09-27 0:02 ` [reiserfs-list] " Dieter Nützel
[not found] ` <200109230016.f8N0G6G25222@zero.tech9.net>
2001-09-23 2:58 ` Robert Love
[not found] ` <200109222120.f8MLKYG24859@zero.tech9.net>
2001-09-23 2:44 ` Robert Love
[not found] ` <200109200757.JAA60995@blipp.internet5.net>
2001-09-20 17:37 ` Roger Larsson
2001-09-20 21:29 ` Robert Love
2001-09-20 21:53 ` Dieter Nützel
[not found] ` <200109200758.f8K7wEG13675@zero.tech9.net>
2001-09-20 21:09 ` Robert Love
2001-09-20 20:01 ` Tobias Diedrich
2001-09-20 22:01 ` Robert Love
2001-09-22 3:57 ` Andre Pang
2001-09-22 6:10 ` Robert Love
2001-09-22 7:22 ` Andre Pang
2001-09-23 3:18 ` george anzinger
2001-09-23 3:21 ` Robert Love
2001-09-23 7:05 ` Robert Love
2001-09-23 12:03 ` Andre Pang
2001-09-23 18:31 ` Robert Love
2001-09-22 12:56 ` ksoftirqd? (Was: Re: [PATCH] Preemption Latency Measurement Tool) Roger Larsson
2001-09-22 13:14 ` Andrea Arcangeli [this message]
2001-09-22 20:51 ` Roger Larsson
2001-09-22 21:33 ` Andrea Arcangeli
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