From: Con Kolivas <kernel@kolivas.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
Nick Piggin <piggin@cyberone.com.au>
Subject: Re: [PATCH] 2.6.0 batch scheduling, HT aware
Date: Sat, 27 Dec 2003 22:15:01 +1100 [thread overview]
Message-ID: <200312272215.01563.kernel@kolivas.org> (raw)
In-Reply-To: <20031227110903.GA1413@elf.ucw.cz>
On Sat, 27 Dec 2003 22:09, Pavel Machek wrote:
> So... even on normal SMP,
> "task-on-other-cpu-slows-down-task-on-this-cpu" effect exists. Okay,
> it is not as visible as on HT machine (50% slowdown), but its
> definitely there.
Sure but I think we're getting pedantic here. The problem is really simple - a
uniprocessor HT desktop booted in SMP mode feels half the speed while running
setiathome (or video encoding or whatever cpu bound task) compared to booting
it in UP mode. So, ironically, enabling the HT makes the machine feel slower
when running multiple tasks. And there will be a heck of a lot of these in
the future.
Con
next prev parent reply other threads:[~2003-12-27 11:15 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-23 0:38 [PATCH] 2.6.0 batch scheduling, HT aware Con Kolivas
2003-12-23 1:11 ` Nick Piggin
2003-12-23 1:24 ` Con Kolivas
2003-12-23 1:36 ` Nick Piggin
2003-12-23 2:42 ` Con Kolivas
2003-12-23 2:57 ` Nick Piggin
2003-12-23 3:15 ` Con Kolivas
2003-12-23 3:16 ` Con Kolivas
2003-12-26 23:03 ` Pavel Machek
2003-12-23 15:51 ` bill davidsen
2003-12-23 22:09 ` Con Kolivas
2003-12-30 0:35 ` bill davidsen
2004-01-02 20:10 ` Bill Davidsen
2003-12-26 22:56 ` Pavel Machek
2003-12-26 23:42 ` Con Kolivas
2003-12-26 23:49 ` Con Kolivas
2003-12-27 11:09 ` Pavel Machek
2003-12-27 11:15 ` Con Kolivas [this message]
2003-12-30 0:29 ` bill davidsen
2003-12-29 7:02 ` Nick Piggin
2003-12-29 12:49 ` Pavel Machek
2003-12-27 8:52 ` Mika Penttilä
2003-12-30 0:32 ` bill davidsen
2004-01-02 20:05 ` Bill Davidsen
2004-01-02 20:56 ` Davide Libenzi
2004-01-02 21:10 ` Valdis.Kletnieks
2004-01-02 23:34 ` Davide Libenzi
2003-12-23 1:59 Nakajima, Jun
2003-12-23 2:40 ` Nick Piggin
2003-12-23 5:33 Nakajima, Jun
2003-12-23 10:13 ` Nick Piggin
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