Messages in this thread | | | Date | Sat, 05 Oct 2002 12:34:04 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] direct-IO API change |
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Lincoln Dale wrote: > > At 04:23 PM 4/10/2002 -0700, Linus Torvalds wrote: > >Especially since I thought that O_DIRECT on the regular file (or block > >device) performed about as well as raw does anyway these days? Or is that > >just one of my LSD-induced flashbacks? > > from my multiple 64/66 PCI bus + multiple 2gbit/s FC HBA tests, yes, > they're around the same. > (now up to 390mbyte/sec throughput on latest & greatest x86 hardware i > have; front-side-bus no longer the limiting factor, but dual 64/66 PCI). > > of course, purely synthetic tests designed to stress Fibre Channel > switching infrastructure, not real-world disk i/o.. >
direct-io has lost its challenge ;)
I'd love to see the result of some pagecache testing on that setup if you have time.
Nothing fancy - just:
for i in $(each ext2 mountpoint) do dd if=/dev/zero of=$i/foo bs-1M count=4000 & done vmstat 1
and
for i in $(each ext2 mountpoint) do cat $i/foo > /dev/null & done vmstat 1
Linus's current BK tree has a few warmups which will help the writeout phase a little. - 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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