Blindly, your bottleneck is DASD I/O....
Look at your dasd performance, your cache statistics, your
MDC Cache hits/misses, your wait states for your samba servers,
channel utilization, type of channels, number of logical devices,
and queues. And what is your CPU utilization? page rate?
("Seem to be OK" often isn't....)
20 MB/sec is about 5,000 I/O per second assuming 4K Blocks. How
many logical devices? You are likely seeing very high connect
times due to linux chaining I/O together, and 100% device utilization.
>
>hi all,
>
>I ran some tests with the 'dbench' benchmark from the samba
>project which simulates the disk i/o of the 'netbench'
>benchmark.
>
>I use 2.4.16 with the acl-patches (ext2/3) on a 128MB RAM system
>under zVM and initially tested dbench simulating 10 clients with
>ext2, ext3 and reiserfs on a minidisk. We have a G5(single proc)
>server connected to our ESS (shark) with 4 ESCON Channels
>(...and I think our machine is only lightly loaded).
>
>With ext2 I got 20-23 MB/s in several runs and with
>ext3/reiserfs 10-13 MB/s. Now I wonder what the bottlenecks are
>supposed to be and what to do to tune this before I'll make some
>further testings?! RAM & CPU seem to be OK for this workload and
>I thought 4 ESCONs should be much faster.
>
>Any ideas?
>Regards
>
>simon
>
>--
>simon fischer
>linux on zSeries - team
>
>becom informationssysteme gmbh - germany
"If you can't measure it, I'm Just NOT interested!"(tm)
/************************************************************/
Barton Robinson - CBW Internet: [EMAIL PROTECTED]
Velocity Software, Inc Mailing Address:
196-D Castro Street P.O. Box 390640
Mountain View, CA 94041 Mountain View, CA 94039-0640
VM Performance Hotline: 650-964-8867
Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM
/************************************************************/
