Messages in this thread |  | | | Date | Fri, 7 Dec 2001 22:37:31 +0100 (CET) | | From | Marco Colombo <> | | Subject | Re: horrible disk thorughput on itanium |
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On Fri, 7 Dec 2001, Greg Hennessy wrote:
> In article <Pine.LNX.4.33.0112070941330.8465-100000@penguin.transmeta.com>, > Linus Torvalds <torvalds@transmeta.com> wrote: > > bonnie is a _benchmark_. It's meant for finding bad performance. Changing > > it to make it work better when performance is bad is _pointless_. You've > > now made the whole point of bonnie go away. > > It isn't just bonnie showing bad performance. My application shows it, > bonnie shows it, and tiobench shows it. I think the focus on putc > may be too intense. It isn't suprizing to me that either the kernel > or glibc may not be optimised on ia64, I'm just trying to figure out > how to get better io rates out of my itanium machine.
Does a simple 'dd' show the problem? I mean,
time dd if=/dev/zero of=/somelargefile count=somelargenumber bs=8k
is it much slower on the itanium, too? dd doesn't use putc(), I hope.
Just for comparison, I've run the following command here:
# time dd if=/dev/zero of=/u2/test count=250000 bs=8k 250000+0 records in 250000+0 records out 0.14user 12.95system 1:23.15elapsed 15%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (117major+18minor)pagefaults 0swaps (Almost idle box, 256MB RAM, UDMA disk, 2.2.x kernel)
You may try with a bigger file, expecially if you have more RAM.
.TM. -- ____/ ____/ / / / / Marco Colombo ___/ ___ / / Technical Manager / / / ESI s.r.l. _____/ _____/ _/ Colombo@ESI.it - 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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