Re: xmm2 - monitor Linux MM active/inactive lists graphically

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On Thu, Oct 25 2001, Linus Torvalds wrote:
>
> On 25 Oct 2001, Zlatko Calusic wrote:
> >
> > Yes, I definitely have DMA turned ON. All parameters are OK. :)
>
> I suspect it may just be that "queue_nr_requests"/"batch_count" is
> different in -ac: what happens if you tweak them to the same values?
>
> (See drivers/block/ll_rw_block.c)
>
> I think -ac made the queues a bit deeper the regular kernel does 128
> requests and a batch-count of 16, I _think_ -ac does something like "2
> requests per megabyte" and batch_count=32, so if you have 512MB you should
> try with
>
> queue_nr_requests = 1024
> batch_count = 32

Right, -ac keeps the elevator flow control and proper queue sizes.

-- 
Jens Axboe
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