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SubjectRe: 2.2.3 has bad interactivity performance.

On Tue, 9 Mar 1999, Lenart Gabor wrote:

> I usually play some mp3 while I'm working on my Linux based server. 2.0.x
> kernels almost NEVER break the playing. Kernel 2.2.2 is not as good as
> 2.0.x but it's good enough. But 2.2.3 seems to be MORE "mp3-playing-breaker" :-)
> Playing stops for a moment when I compiling programs. It has always never
> happend with 2.2.2 and even more rarly with 2.0.x kernels.
>
> What is the wrong about scheduler of 2.2.3 which cause this ? Or it's
> something harddisk related (playing mp3 from harddisk) problem ?

there are no scheduling changes in 2.2.3. i usually 'test' interactivity
by running 'ping otherhost' while doing a kernel compile, and with 2.2.3 i
just got:

123 packets transmitted, 123 packets received, 0% packet loss
round-trip min/avg/max = 0.1/0.1/0.6 ms
[mingo@moon mingo]$

this kernel compilation causes a load of 15. And never was the ping
process delayed for more than 0.6 seconds. (and the average was 0.1 msecs)
Needless to say, interactive 'feeling' is good as well, not only ping
times.

sound drivers are of course different from networking sockets, driver bugs
_might_ cause such problems.

does a simple inifit loop trigger this behavior? Or do you need heavy disk
(or networking) traffic to trigger it?

-- mingo


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