Re: BUG: Slowdown on 3000 socket-machines tracked down
From: Andrew Morton
Date: Thu Mar 10 2005 - 04:14:04 EST
Andi Kleen <ak@xxxxxx> wrote:
> In general to solve it one has to increase /proc/sys/vm/freepages
> a lot.
> It would be nice though if the VM tuned itself dynamically to a lot
> of GFP_ATOMIC requests. And maybe if GFP_ATOMIC was a bit more aggressive
> and did some simple minded reclaiming that would be helpful too.
> e.g. there could be a "easy to free" list in the VM for clean pages
> where freeing is simple enough that it could be made interrupt safe.
I spose we could autotune the free memory thresholds somehow, if there is
good reason and a testcase.
Or we could run page reclaim from hard IRQ context - that could be a bit
expensive in terms of CPU consumption and latency though.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/