Messages in this thread | | | Date | Mon, 10 Feb 2003 08:20:38 +0100 | From | Andrea Arcangeli <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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On Mon, Feb 10, 2003 at 02:29:20AM -0200, Rik van Riel wrote: > On Sun, 9 Feb 2003, David Lang wrote: > > > note that issuing a fsync should change all pending writes to 'syncronous' > > as should writes to any partition mounted with the sync option, or writes > > to a directory with the S flag set. > > Exactly. This is nasty with our current data structures; > probably not something to do during the current code slush.
as I said, you can consider asychronous all requests submitted with current->mm, this will be 90% accurate. This whole thing is an heuristic, if the heuristic fails the behaviour become like w/o SFQ so no regression. Also the latency of fsync is less critical than the latency of a read() syscall, again, this is statistically, sometime it can be the other way around.
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