Messages in this thread | | | Date | Sat, 15 May 2004 20:50:22 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH] slabify iocontext + request_queue |
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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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