Messages in this thread |  | | Date | Wed, 31 Oct 2001 15:59:34 +0100 | From | "J . A . Magallon" <> | Subject | Re: cdrecord from ext3 |
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On 20011031 Andrew Morton wrote: >"J . A . Magallon" wrote: > >> Kernel: 2.4.13-ac5+bproc, controller is an Adaptec >> > >bproc? scyld distributed process thing, or something else? >
Yep.
>Something strange is happening. Could you please investigate >further? For example: > > dd if=/dev/zero of=foo bs-1024k count=600 > time cat foo > /dev/null > >How long does the `cat' take on ext2 and ext3? >
Tried several times. Basic script is:
rm -f foo echo ext2 create: time dd if=/dev/zero of=foo bs=1024k count=600 sync echo ext2 read: time cat foo > /dev/null rm -f foo
and results a similar to this (but read below..):
ext2 create: 600+0 records in 600+0 records out 0.02user 5.73system 0:27.43elapsed 20%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (119major+18minor)pagefaults 0swaps
ext2 read: 0.24user 4.85system 0:27.57elapsed 18%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (100major+17minor)pagefaults 0swaps
ext3 create: 600+0 records in 600+0 records out 0.00user 12.20system 1:12.28elapsed 16%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (119major+18minor)pagefaults 0swaps
ext3 read: 0.19user 6.30system 1:21.73elapsed 7%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (100major+17minor)pagefaults 0swaps
Did you noticed that the ext3 was at 20MHz, and ext2 was at 40MHz ? I will reformat the 20MHz drive and make 2 slices, one ext2 and one ext3 to be sure not to compare apples and oranges...
-- J.A. Magallon # Let the source be with you... mailto:jamagallon@able.es Mandrake Linux release 8.2 (Cooker) for i586 Linux werewolf 2.4.13-ac5-beo #1 SMP Tue Oct 30 00:10:00 CET 2001 i686 - 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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