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SubjectRe: Disk-I/O and % system (2.4.18-pre9)
From
Heinz Diehl wrote:
> Downgrade to 2.4.18-pre8 and use Michael Cohen's patch from
> "ftp://ftp.kernel.org/pub/linux/kernel/people/mjc/linux-2.4/",

That doesn't help. I tried 2.4.16 with Debian modifications, said
kernel patched to 2.4.18-pre9, stock 2.4.17, stock 2.4.18-pre9 and
2.4.18-pre8-mjc with preempt and lockbreak, and all behave alike.

On a plain ext2-filesystem on a primary partition I get (with -mjc):

During the sync the system is extremly sluggish, and once during my
tests it froze completely (it did still return pings with a normal
speed) so that I had to press reset.

The same operations on a slower computer running 2.2.20 are consideraby
faster:

$ time tar -xzf linux-2.4.17.tar.gz; time sync

real 0m7.716s
user 0m5.430s
sys 0m2.110s

real 0m6.332s
user 0m0.000s
sys 0m0.120s

> Latency in stock 2.4.17/18-pre kernels is well known :\

this looks like more than a latency issue :-(.

Yours, Florian Hars.
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