Messages in this thread | | | Date | Mon, 10 Feb 2003 03:21:01 -0800 | From | Andrew Morton <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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Andrea Arcangeli <andrea@suse.de> wrote: > > On Mon, Feb 10, 2003 at 09:40:34PM +1100, Nick Piggin wrote: > > I don't know too much about SCSI stuff, but if driver / wire / device > > overheads were that much higher at 128K compared to 512K I would > > think something is broken or maybe optimised badly. > > I guess it's also a matter of the way the harddisk can serve the I/O if > it sees it all at the same time, not only the cpu/bus protocol after all > minor overhead. Most certainly it's not a software mistake in linux > that the big commands runs that much faster. Again go check the numbers > in bigbox.html between my tree, 2.4 and 2.5 in bonnie read sequential, > to see the difference between 128k commands and 512k commands with > reads, these are facts. (and no writes and no seeks here) >
I thought scsi in 2.5 was doing 512k I/O's at present???
Doesn't Randy attribute the differences there to an updated qlogic driver? (Or was the update to allow 512k I/O's? ;)) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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