On Friday 27 July 2001 16:34, Daniel Phillips wrote:
> On Friday 27 July 2001 23:08, Roger Larsson wrote:
> > Hi all,
> >
> > I have done some throughput testing again.
> > Streaming write, copy, read, diff are almost identical to earlier 2.4
> > kernels. (Note: 2.4.0 was clearly better when reading from two files
> > - i.e. diff - 15.4 MB/s v. around 11 MB/s with later kenels - can be
> > a result of disk layout too...)
> >
> > But "dbench 32" (on my 256 MB box) results has are the most
> > interesting:
> >
> > 2.4.0 gave 33 MB/s
> > 2.4.8-pre1 gives 26.1 MB/s (-21%)
> >
> > Do we now throw away pages that would be reused?
> >
> > [I have also verified that mmap002 still works as expected]
>
> Could you run that test again with /usr/bin/time (the GNU time
> function) so we can see what kind of swapping it's doing?
>
I also saw a significant drop in dbench 32 results.
Here are a few more data points, this time comparing 2.4.8-pre1 with 2.4.7.
2.4.7 9.3422 MB/sec vs 2.4.8-pre1 6.88884 MB/sec average of 3 runs
The system under test has 384 MB of memory, and did not go
into swap during the test. I performed a set of three runs immediately after
a boot, and with no pauses in between individual runs. I used time ./dbench 32
and caputured the output in a file using script `uname -r`. The tests were done
with X and KDE running, but no other activity.
Here are the results of the six runs:
Steven
-----------------------------------------------------------------------------
2.4.7 average 9.3422 MB/sec
Throughput 9.2929 MB/sec (NB=11.6161 MB/sec 92.929 MBit/sec)
34.11user 238.89system 7:34.59elapsed 60%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
Throughput 9.56338 MB/sec (NB=11.9542 MB/sec 95.6338 MBit/sec)
34.07user 262.44system 7:22.72elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
Throughput 9.17032 MB/sec (NB=11.4629 MB/sec 91.7032 MBit/sec)
33.79user 248.46system 7:41.62elapsed 61%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
-----------------------------------------------------------------------------
2.4.8-pre1 average 6.88884 MB/sec
Throughput 6.8078 MB/sec (NB=8.50975 MB/sec 68.078 MBit/sec)
34.30user 358.35system 10:21.57elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
Throughput 6.91993 MB/sec (NB=8.64992 MB/sec 69.1993 MBit/sec)
33.62user 369.55system 10:11.43elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
Throughput 6.93879 MB/sec (NB=8.67349 MB/sec 69.3879 MBit/sec)
33.33user 341.58system 10:09.77elapsed 61%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1008major+1402minor)pagefaults 0swaps
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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:36 EST