Scheduling and preformance

Mindstab · Posted: Sun Apr 11, 2004 5:12 am Post subject: Scheduling and preformance

Has anyone else noticed a decrease in preformance with schedualing as the kernel evolves.

Once upon a time, I used to be able to run a compile job and play UT with no noticable lag.

After upgrading to the 2.6 kernel, these days were ended. Most games were too laggy to play if the system was compiling. This has improved somewhat with 2.6.5.

I figured it might not be worth mentioning if this was just me, however a friend of mine just upgraded from ~2.4.20 to 2.4.25 and npticed the same drop in performance.

Anyone else notice this?

ed0n · Posted: Sun Apr 11, 2004 7:08 am Post subject:

I have not noticed this. Anyway ut also lags, here a bit when I am compiling (P4 1.6ghz 512mb ram, nvidia gf 64mb). And also I am running love3 (latest), it uses nick's sched policies. I will try again today and see if it really lags.

rfujimoto · Apprentice Joined: 22 Mar 2004 Posts: 195

I haven't noticed too much lag from moving from 2.4 to 2.6. I actually found I could have more concurrent jobs running without slowdown. That said, I don't own UT so I couldn't tell you if it would be the same. Perhaps it's a UT and 2.6 thing, not necessarily a specific 2.6 I/O sched thing?

I know this doesn't answer your original post as it shouldn't change between kernels, but is emerge running nice'd? I have nice'd just about everything that it makes sense to so I may not notice a lot of things hehe

ed0n · Posted: Sun Apr 11, 2004 7:27 am Post subject:

I just tried it. I don't notice in the game any big lagg, just some small ones in action time

. Anyway the game is playable when I am compiling, but I don't play it becouse when I play fps games, I don't want any lagg :twisted:

.

Spawn of Lovechild · Posted: Sun Apr 11, 2004 1:05 pm Post subject:

it greaty depends on which scheduler you are using, -mm fx. is at the moment messing with the scheduler I think, Con has a scheduler, Nick has one... and then there's the one in mainline.
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ed0n · Posted: Sun Apr 11, 2004 1:19 pm Post subject:

ewan.paton · Posted: Sun Apr 11, 2004 3:27 pm Post subject:

i noticed it, it got so bad i bought extra ram and a new scsi disk thinking it was a hardware problem, cfq was a nightmare but the i was running services which were constantly accesing the disk and my destktop interactivity was terible
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Mindstab · Posted: Sun Apr 11, 2004 6:55 pm Post subject:

hmm.... UT was just an example
its the same for other games like quake3 etc

changing make.confs nice value to 20 helped a bunch but i'm not sure if thats great...