Messages in this thread | | | Date | Wed, 23 Jan 2002 13:37:28 -0800 | From | Andrew Morton <> | Subject | Re: Low latency for recent kernels |
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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
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