Re: 2.4.19' drivers/block/ll_rw_blk.c

From: Jens Axboe (
Date: Tue Aug 06 2002 - 10:12:05 EST

On Mon, Aug 05 2002, Marc-Christian Petersen wrote:
> Hi there,
> could you please consider changing those very slow behaviour in
> "drivers/block/ll_rw_blk.c"? ... Benchmarked against 2.4.18 this is horribly
> slower ... Doing some heavy disk i/o, want to start another thing, system
> freeze for some seconds ... Opening a xterm , Ctrl-D to leave, this takes
> about 5 seconds and somewhat is doing flushing to the disk.
> Maybe req_finished_io ?
> Adrian, could this be the problem you've experienced?

This is a crazy bug report, sorry :-)

What slow behaviour in ll_rw_blk.c?! Consider providing vmstat when the
slowdown takes place. Also, try enable profiling if it seems like hard
system freezes.

> Afaik this was changed for 2.4.19-pre7 and above.

2.4.19-pre7 works fine, 2.4.19-pre8 stinks?

Jens Axboe

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