Messages in this thread |  | | Date | Tue, 3 Oct 2000 09:50:23 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: 2.4.0-test9-pre8 |
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On Tue, 3 Oct 2000, Martin Diehl wrote:
> * deadlock in initscripts (even for runlevel 2). SysRq shows idle_task > being the only one ever getting the CPU when deadlocked.
This suggests tasks yielding the CPU while task->state != TASK_RUNNABLE, which results in them never being rescheduled again ...
(time to hunt down the rescheduling points)
> * Following a suggestion from Jeff Garzik to save the disk from heavy > trashing during my mem=8M test, I've tried to use a ramdisk for > swapping - Yes, I know, this is pretty stupid in normal use and might > even be illegal (i.e. not expected to work by design). Anyway, I've > tried it and was working when used as a swapdevice (size=64M, bs=4k). > Added with priority 0 and the normal swap partition kept for fallback > with prio=-1. No problems. It did even gracefully swapoff the ramdisk > while it was already filled and the box was swapping to disk. > To make thinks even more stupid, I've tried a second thing: create > an ext2-fs (bs=4k) on the ramdisk, mount it, and use a swapfile on > top of it. This deadlocks (with kswapd being current forever) at the > very moment the swapfile ist filled and swapping has to go to the > fallback raw swap partition. > As already said, I wouldn't be surprised, if swapping to rd were > broken. But swapping to a rd-partition appears solid while a rd-based > swapfile deadlocks. Could the difference be explained somehow or might > it indicate some deadlock path due to VM-fs interaction not > covered otherwise - so far?
Could be. I'll look into this since it could make a difference to swap-over-nbd as well ...
> 2.4.0-t9p8 + 2.4.0-t9p7-vmpatch appears to be a big step in the > right direction. What did impress me most, was the performance > boost: make bzImage with mem=8M needed about 2h to complete - > whereas for t9p7 it was 6-7h!
Thanks go out to Ananth for spotting the bug which caused this ;)
regards,
Rik -- "What you're running that piece of shit Gnome?!?!" -- Miguel de Icaza, UKUUG 2000
http://www.conectiva.com/ http://www.surriel.com/
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