Re: Terrible VM in 2.4.11+?

[Austin Gonyou <austin@digitalroadkill.net>]

Here's the params I'm running...but it is with a -aa tree, just FYI.

vm.bdflush = 60 1000 0 0 1000 800 60 50 0


On Mon, 2002-07-08 at 17:50, Lukas Hejtmanek wrote:
> Yes, I know a few people that reports it works well for them. How ever for me
> and some other do not. System is redhat 7.2, ASUS A7V MB, /dev/hda is on promise
> controller. Following helps a lot:
> 
> while true; do sync; sleep 3; done
> 
> How did you modify the params of bdflush? I do not want to suspend i/o buffers 
> nor disk cache.. 
> 
> Another thing to notice, the X server has almost every time some pages swaped to
> the swap space on /dev/hda. When bdflushd is flushing buffers X server stops as
> has no access to the swap area during i/o lock.
> 
> On Mon, Jul 08, 2002 at 05:37:02PM -0500, Austin Gonyou wrote:
> > I do things like this regularly, and have been using kernels 2.4.10+ on
> > many types of boxen, but have yet to see this behavior. I've done this
> > same type of test with 16k blocks up to 10M, and not had this problem I
> > usually do test with regard to I/O on SCSI, but have tested on IDE,
> > since we use many IDE systems for developers. I found though, that using
> > something like LVM, and overwhelming it, causes bdflush to go crazy. I
> > can hit the wall you refer to then.When bdflushd is too busy...it does
> > in fact seem to *lock* the system, but of course..it's just bdflush
> > doing it's thing. If I modify the bdflush params..this causes things to
> > work just fine, at least, useable.
> 
> -- 
> Lukáš Hejtmánek
-- 
Austin Gonyou <austin@digitalroadkill.net>