Kris Kennaway disse na ultima mensagem: >> >> But also I checked the ULE/BSD against my particular problem and there >> is >> no difference at all. I get no acceptable disk read performance when >> comparing what I had with 4.11, wether with ULE or with 4BSD > > Be very careful, because I've personally measured severe disk I/O > penalties with ULE on SMP hardware. In fact in my testing ULE gives > worse SMP performance under load across the board compared to 4BSD > (it's only faster for the lightest of workloads). >
seems suspicious and I will compile this night and recheck to be sure > If you're absolutely certain that ULE is not to blame (and want to > continue to take the risk of other performance and stability problems > down the line), that basically leaves something to do with the scsi > driver and/or its interaction with your hardware as the probable > cause. I don't know enough about this particular hardware to comment > further though. I will check 4BSD again, but I do not have stability problems. The system works really constant and without any odds but the diskio thing certainly the reason why I have a LSI card is that I was blaming the adaptec driver first, but even with the adaptec disabled and the LSI card on the Supermicro nothing changed. So I do not know for sure but unlikely both drivers have the same problem I guess. > > * adaptive mutexes are usually a win so it's a bit unusual that you > have disabled them, but I assume you have tested this. > I get better network performance when not using polling with it and seems not to harm polling in my case so I let it in > * Dunno about the AUTO_EOI_1 option, I don't think you even have this > hardware on your system (device atpic didn't probe in your dmesg). right, it is a old setting I ever forget taking it out > > * HZ=1000 is superfluous since it is the default but may or may not > help. In some workloads the increased overhead relative to the old > default of HZ=100 gives a performance loss. Maybe it helps with > polling though, I dunno. that I did not know but does no bad either. With lower HZ it does not work for me and I have the impression it works better with 2000. I have 5 NICs and that is the reason I guess. But it is not my priority at this moment and I believe it does not mess with diskio. Michel computador é como nem cavalo e mulher mais que montam neles, pior que ficam ... **************************************************** Datacenter Matik http://datacenter.matik.com.br E-Mail e Data Hosting Service para Profissionais. **************************************************** _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[EMAIL PROTECTED]"
