From: Andrew Morton <akpm@zip.com.au>
To: "Mauricio Nuñez" <mnunez@maxmedia.cl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Low latency for recent kernels
Date: Wed, 23 Jan 2002 13:37:28 -0800 [thread overview]
Message-ID: <3C4F2D18.5DC72FFE@zip.com.au> (raw)
In-Reply-To: <20020123091643.A182@earthlink.net> <3C4F0DFA.50601@lexus.com> <3C4F10F9.87A3B2E@zip.com.au>, <3C4F10F9.87A3B2E@zip.com.au> <02012318041500.01883@mauricio.chile.com>
Mauricio Nuñez wrote:
>
> Hi,
>
> I'm sending some feedback !
> :-)
Is good. Thanks.
> I'm trying this patch... (in 2.4.18-pre6)
> I'm feeling a improved performance ,as a desktop user.
> I'm working with KDE2, Netbeans and VMWare.
> Pentium III 666Mhz , 192M Ram, 10GB HD.
I'm a little surprised that desktop users do notice significant
benefits with all the latency/preempt patches. If you actually
instrument the kernel's behaviour, the stalls are in fact
quite small and infrequent. See the histograms in
http://www.uwsg.iu.edu/hypermail/linux/kernel/0201.0/1624.html
Probably, poor interactivity on the desktop is more due to
waiting on disk reads - a combination of bad read latency
in the presence of write traffic and unfortunate page replacement
decisions.
Try http://www.zipworld.com.au/~akpm/linux/2.4/2.4.18-pre6/read-latency2.patch
> What are the tools to check this better performance?
> Or my impression is sufficient ?
The simplest tool to use is Mark Hahn's `realfeel' app. See
http://www.zip.com.au/~akpm/linux/amlat.tar.gz
-
next prev parent reply other threads:[~2002-01-23 21:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-23 14:16 Low latency for recent kernels rwhron
2002-01-23 19:24 ` J Sloan
2002-01-23 19:37 ` Andrew Morton
2002-01-23 21:04 ` Mauricio Nuñez
2002-01-23 21:37 ` Andrew Morton [this message]
2002-01-23 22:18 ` Daniel Phillips
[not found] <fa.h7o6q7v.lha792@ifi.uio.no>
[not found] ` <fa.divhjuv.3guviq@ifi.uio.no>
2002-01-24 3:48 ` Dan Maas
2002-01-24 4:17 ` Robert Love
2002-01-24 4:20 ` Glendon Gross
2002-01-24 4:28 ` Robert Love
2002-01-24 6:34 ` Glendon Gross
-- strict thread matches above, loose matches on Subject: below --
2002-01-22 21:39 Louis Garcia
2002-01-22 21:46 ` Andrew Morton
2002-01-22 22:00 ` J Sloan
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