Re: [patch] voluntary-preempt-2.6.8.1-P4

Lee Revell
2004-08-20T03:34:03Z

On Thu, 2004-08-19 at 03:32, Ingo Molnar wrote:
> i've uploaded the -P4 patch:
>
> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4

I think I am seeing those weird ~1 ms latencies still (actually I am not
sure I saw before now):

http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/kswapd_latency_trace.txt

This was the result of doing `make -j12' with a large C++ program (I
know, I wanted to see what would happen). This gradually slowed the
machine to a crawl - for a while I could watch the /proc/latency_trace
fiels and see the latency gradually climbing. Eventually tha machine
ground almost to a halt, with lots of disk activity., and trying to
switch from X to a console window resulted in a blank screen for 2-3
minutes. I did eventually get a text console and was able to kill all
the cc1plus processes, and the machine went back to normal.

The link above is the highest latency recorded during this episode.

Lee