Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait

From: Jens Axboe (
Date: Tue Feb 06 2001 - 15:49:04 EST

On Tue, Feb 06 2001, Ben LaHaise wrote:
> =) This is what I'm seeing: lots of processes waiting with wchan ==
> __get_request_wait. With async io and a database flushing lots of io
> asynchronously spread out across the disk, the NR_REQUESTS limit is hit
> very quickly.

You can't do async I/O this way! In going what Linus said, make submit_bh
return an int telling you if it failed to queue the buffer and use
READA/WRITEA to submit it.

Jens Axboe

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