Re: 2.4.20: Proccess stuck in __lock_page ...

Marc-Christian Petersen
2003-05-27T18:06:13Z

On Tuesday 27 May 2003 19:57, Marcelo Tosatti wrote:

Hi Marcelo,

> > I do, people I know do also, numbers of those people only _I_ know are
> > about ~30. I've reported this problem over a year ago while 2.4.19-pre
> > time.
> Can you please try to reproduce it with -aa?
not again ;)

I've tried almost all known kernel tree's around, every kernel has the same
effect. I even tried SuSE and Redhat Kernels.

I've 'wasted' tons of time just find a solution for it.

Andrea introduced, to address _exact_ this problem (pauses, stops, mouse is
dead etc.), his lowlatency elevator. Side effect: decreases i/o throughput,
and the "pauses/stops" are still there. Much less but not gone.

The _only_ workaround yet (known to the public) is to change nr_requests in
drivers/block/ll_rw_blk.c from 128 to 4 which gives a performance hit of
about 40% (not acceptable in any way).

.oO( I am quite sure I've mailed you all this stuff privately in response to
your private mail to me ;) )Oo.

ciao, Marc