Messages in this thread |  | | | Date | Mon, 14 Jul 2003 07:49:18 +0200 | | From | Jens Axboe <> | | Subject | Re: RFC on io-stalls patch |
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On Sun, Jul 13 2003, Andrea Arcangeli wrote: > On Sun, Jul 13, 2003 at 11:01:16AM +0200, Jens Axboe wrote: > > No I don't have anything specific, it just seems like a bad heuristic to > > get rid of. I can try and do some testing tomorrow. I do feel strongly > > well, it's not an heuristic, it's a simplification and it will certainly > won't provide any benefit (besides saving some hundred kbytes of ram per > harddisk that is a minor benefit).
You are missing my point - I don't care about loosing the extra request list, I never said anything about that in this thread. I care about loosing the reserved requests for reads. And we can do that just fine with just holding back a handful of requests.
> > that we should at least make sure to reserve a few requests for reads > > exclusively, even if you don't agree with the oversized check. Anything > > else really contradicts all the io testing we have done the past years > > that shows how important it is to get a read in ASAP. And doing that in > > Important for latency or throughput? Do you know which is the benchmarks > that returned better results with the two queues, what's the theory > behind this?
Forget the two queues, noone has said anything about that. The reserved reads are important for latency reasons, not throughput.
-- Jens Axboe
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