Re: [PATCH] slabify iocontext + request_queue

From: Christoph Hellwig
Date: Sat May 15 2004 - 14:51:20 EST

On Sat, May 15, 2004 at 07:30:04PM +0200, Jens Axboe wrote:
> > While I agree on the io_context part, slabifying request_queue is a space
> > waste on most machines out there. The averange desktop has less than a
> > handfull of these, and even for smaller servers it doesn't exactly look
> > like a gain.
> See the thread last week on queue congestion threshold calculations,
> there were some numbers in there.

Maybe my math is completely off, but with slab you'd need a page at least,
the kmem_cache_t and maybe a kmem_bufctl_t

So for the usual two or three queue desktops we went from 1024 or 1536
to 4096 + N.

Cutoff point is at aproximately 9 queues which I think most machines running
linux won't reach.

Anyway, not that this is really important, I think we just need to question
all this silent bloating a little..

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