Messages in this thread |  | | Date | Sat, 2 Dec 2000 16:42:34 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] livelock in elevator scheduling |
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On Fri, Dec 01 2000, Russell Cattelan wrote: > > If performance is down, then that problem is most likely elsewhere. > > I/O limited benchmarking typically thrives on lots of request > > latency -- with that comes better throughput for individual threads. > > > > > Anyway, I'll try your patch. > > Well this patch does help with the request starvation problem. > Unfortunately it has introduced another problem. > Running 4 doio programs, on and XFS partion with KIO buf IO turned on.
This looks like a generic aic7xxx problem, and not block related. Since you are doing such nice traces, what is the other CPU doing? CPU1 seems to be stuck grabbing the io_request_lock (for reasons not entirely clear from reading the aic7xxx source...)
-- * Jens Axboe <axboe@suse.de> * SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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