Messages in this thread | | | Date | Mon, 15 Apr 2002 01:14:36 -0700 | From | J Sloan <> | Subject | Re: 2.5.8 final - another data point |
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Andrew Morton wrote:
>It's not related to BIO. dbench is all about higher-level >memory management, high-level IO scheduling and butterfly >wings. > Yes, no doubt and a lot of other deep magic which is only dimly perceived by the likes of yours truly....
>> >>Throughput 150.159 MB/sec (NB=187.698 MB/sec 1501.59 MBit/sec) 8 procs >>Throughput 7.25691 MB/sec (NB=9.07113 MB/sec 72.5691 MBit/sec) 16 procs >>Throughput 6.36332 MB/sec (NB=7.95415 MB/sec 63.6332 MBit/sec) 32 procs >> > >It's obviously fallen over some cliff. Conceivably the larger readahead >window causes this. How much memory does the machine have? > The box has 512 MB RAM -
>`dbench 64' >on a 512 meg setup certainly causes readahead thrashing. You can >stick a `printk("ouch");' into handle_ra_thrashing() and watch it... > hmm - OK, will try that -
Just for giggles, same machine with 2.4.19-pre4-ac4 -
Throughput 150.979 MB/sec (NB=188.723 MB/sec 1509.79 MBit/sec) 1 procs Throughput 150.796 MB/sec (NB=188.496 MB/sec 1507.96 MBit/sec) 2 procs Throughput 151.185 MB/sec (NB=188.982 MB/sec 1511.85 MBit/sec) 4 procs Throughput 141.255 MB/sec (NB=176.568 MB/sec 1412.55 MBit/sec) 8 procs Throughput 105.066 MB/sec (NB=131.332 MB/sec 1050.66 MBit/sec) 16 procs Throughput 69.3542 MB/sec (NB=86.6928 MB/sec 693.542 MBit/sec) 32 procs Throughput 32.4904 MB/sec (NB=40.613 MB/sec 324.904 MBit/sec) 64 procs Throughput 30.4824 MB/sec (NB=38.103 MB/sec 304.824 MBit/sec) 80 procs Throughput 19.0265 MB/sec (NB=23.7832 MB/sec 190.265 MBit/sec) 128 procs
> > >Patience. 2.5.later-on will perform well. :) > Oh, yes -
It's already quite usable for some workloads, and the latency for workstation use is quite good - I am looking forward to the maturation of this diamond in the rough
:-)
Joe
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