Re: problems with I/O performance with 2.4.12-ac3

safemode
2001-10-20T00:16:06Z

On Friday 19 October 2001 13:14, Andrei Lahun wrote:
> On Fri, 19 Oct 2001 09:27:35 -0400
>
> safemode <safemode@speakeasy.net> wrote:
> > You should give ide and drive chipset info. This is not a problem seen
> > by everyone using the ac3 kernel. Mine for instance run just fine. What
> > settings did you use with bonnie++? all of this is required info if
> > someone wanted to look and see why you are getting those numbers.
>
> My chipset is VIA apollo 133-A ( old shirt).
> I have run bonnie++ just like bonnie -s 256 , and i have 128 MB of memory,
> disk is MAXTOR 52049H4.With old kernels i always had results something like
> i have with 2.4.13-pre now . And i have read one post in lkml about 2 times
> less write output with 2.4.13 -pre comparing with ac, mine result are
> opposite.

2.4.12-ac3-preempt-hogstop (no vm patches after the hogstop patch of a
couple days ago).
PDC20262: chipset revision 1
(my drive on the VIA vt82c686a (rev 22) is too full to run the test)
Maxtor 32049H2, ATA DISK drive
All tests were done on this drive.

(not clean boot)

test results (bonnie++) no extra arguments.
Version 1.02 ------Sequential Output------ --Sequential Input-
--Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec
%CP
psuedomode 1504M 6668 95 27108 39 5429 8 6217 82 22005 11 76.9
0
------Sequential Create------ --------Random
Create--------
-Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP
16 1501 97 +++++ +++ +++++ +++ 1548 99 +++++ +++ 4056
99
psuedomode,1504M,6668,95,27108,39,5429,8,6217,82,22005,11,76.9,0,16,1501,97,+++++,+++,+++++,+++,1548,99,+++++,+++,4056,99

hdparm results
Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec
Timing buffer-cache reads: 128 MB in 1.00 seconds =128.00 MB/sec
(run in that order)

dbench results (./dbench 32)
Throughput 47.3829 MB/sec (NB=59.2286 MB/sec 473.829 MBit/sec)