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SubjectRe: Linux-2.2.0 bad VM behaviour "dd if=/dev/zero of=/dev/hdc bs=256k"
> 
> Can you try the patch below (made against 2.2.2-pre2)? The key is to
> recognise that when we wake up bdflush, we need to take into account how
> many dirty buffers there are; but when we decide whether or not to wait
> for the bdflush pass to complete, it is BUF_LOCKED, not BUF_DIRTY,
> buffers which are important. If we don't wait for bdflush once
> BUF_LOCKED grows too high, then we will simply continue to create more
> locked IO buffers until the request queues are completely saturated.
>

How very appropriate. I've been whining about this to a lot of folks
lately- all of primary memory gets saturated with buffers needing to be
flushed and response time goes to hell.


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