Messages in this thread |  | | | Date | Sun, 14 Apr 2002 22:46:43 -0700 | | From | J Sloan <> | | Subject | Re: 2.5.8 final - another data point |
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J Sloan wrote:
> Observations - > > The up-fix for the setup_per_cpu_areas compile > issue apparently didn't make it into 2.5.8-final, > so we had to apply the patch from 2.5.8-pre3 > to get it to compile. > > That said, however, everything works, all services > are running, all devices working, Xfree is happy.
Stop me if you've heard this one before -
But there is one additional observation:
dbench performance has regressed significantly since 2.5.8-pre1; the performance is equivalent up to 8 instances, but at 16 and above, 2.5.8 final takes a nosedive. Performance at 128 instances is approximately 20% of the throughput of 2.5.8-pre1 - which is in turn not up to 2.4.xx performance levels. I realize that the BIO has been through heavy surgery, and nowhere near optimized, but this is just a data point...
hdparm -t shows normal performance levels, for what it's worth
2.5.8-pre1 -------------- Throughput 151.152 MB/sec (NB=188.94 MB/sec 1511.52 MBit/sec) 1 procs Throughput 152.177 MB/sec (NB=190.221 MB/sec 1521.77 MBit/sec) 2 procs Throughput 151.965 MB/sec (NB=189.957 MB/sec 1519.65 MBit/sec) 4 procs Throughput 151.068 MB/sec (NB=188.835 MB/sec 1510.68 MBit/sec) 8 procs Throughput 43.0191 MB/sec (NB=53.7738 MB/sec 430.191 MBit/sec) 16 procs Throughput 9.65171 MB/sec (NB=12.0646 MB/sec 96.5171 MBit/sec) 32 procs Throughput 37.8267 MB/sec (NB=47.2833 MB/sec 378.267 MBit/sec) 64 procs Throughput 14.0459 MB/sec (NB=17.5573 MB/sec 140.459 MBit/sec) 80 procs Throughput 16.2971 MB/sec (NB=20.3714 MB/sec 162.971 MBit/sec) 128 procs 2.5.8-final --------------- Throughput 152.948 MB/sec (NB=191.185 MB/sec 1529.48 MBit/sec) 1 procs Throughput 151.597 MB/sec (NB=189.497 MB/sec 1515.97 MBit/sec) 2 procs Throughput 150.377 MB/sec (NB=187.972 MB/sec 1503.77 MBit/sec) 4 procs 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 Throughput 5.55008 MB/sec (NB=6.9376 MB/sec 55.5008 MBit/sec) 64 procs Throughput 5.82333 MB/sec (NB=7.27916 MB/sec 58.2333 MBit/sec) 80 procs Throughput 3.40741 MB/sec (NB=4.25926 MB/sec 34.0741 MBit/sec) 128 procs
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