I've been on RELENG_5 for about 1 week now running ULE with PREEMPT. Recently, I noticed some strange behavior that could be related to scheduling; usually I leave my computer on all night (doing nothing as I sleep), But when I'd wake up, and drag a window around, it seems this sudden rush of input catches the scheduler by surprise and everything is really slow for about 5 seconds. Its a peculiar type of "slow" since everything moves smoothly, just 1-2 seconds behind, theres no stuttering at all. Gkrellm shows my cpu usage to peak for the time its really slow, and then drop to normal when everything "pops" back into speed. I guess the best way to describe it would be "bullet time" on your desktop. - Julio
Julio Capote wrote:> I've been on RELENG_5 for about 1 week now running ULE with PREEMPT. > Recently, I noticed some strange behavior that could be related to > scheduling; usually I leave my computer on all night (doing nothing as I > sleep), But when I'd wake up, and drag a window around, it seems this > sudden rush of input catches the scheduler by surprise and everything is > really slow for about 5 seconds. Its a peculiar type of "slow" since > everything moves smoothly, just 1-2 seconds behind, theres no stuttering > at all. Gkrellm shows my cpu usage to peak for the time its really slow, > and then drop to normal when everything "pops" back into speed. I guess > the best way to describe it would be "bullet time" on your desktop.^^^^^^^^^^^ Sounds like a feature... ;-) Seriously, though: I recently tried ULE+PREEMPTION on a few machines and got some panics on my SMP box (http://lists.freebsd.org/pipermail/freebsd-stable/2005-February/011951.html). My UP machines haven't done anything too strange, though. *shrug* Getting a lot closer, but not quite there yet... Jon
On Thu, Feb 17, 2005 at 03:12:57PM -0500, Julio Capote wrote:> I've been on RELENG_5 for about 1 week now running ULE with PREEMPT. > Recently, I noticed some strange behavior that could be related to > scheduling; usually I leave my computer on all night (doing nothing as I > sleep), But when I'd wake up, and drag a window around, it seems this > sudden rush of input catches the scheduler by surprise and everything is > really slow for about 5 seconds. Its a peculiar type of "slow" since > everything moves smoothly, just 1-2 seconds behind, theres no stuttering > at all. Gkrellm shows my cpu usage to peak for the time its really slow, > and then drop to normal when everything "pops" back into speed. I guess > the best way to describe it would be "bullet time" on your desktop.It's probably just paging stuff back in after having paged it out overnight to run something like the nightly cron jobs. Kris -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 187 bytes Desc: not available Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20050217/7d955564/attachment.bin