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SubjectRe: cdrecord from ext3

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
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