Messages in this thread | | | Date | Fri, 11 Mar 2005 20:27:14 +0100 | From | Christian Schmid <> | Subject | Re: BUG: Slowdown on 3000 socket-machines tracked down |
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Ben Greear wrote: > Christian Schmid wrote: > >> OHGAWD I GOT IT!!!!!!!! >> >> I admit, totally coincidentially but its really FIXED. Today I went to >> the puter scanning the servers by routine and wondered why the >> bandwidth is at 100% without any holes. >> >> The only thing I have done is I switched off hyper-threading because >> the server is at only 20% CPU anyway so I just disabled it. >> >> So its something with linux dealing with hyper-threading. YAY :) > > > For what it's worth, I was running dual-xeon systems with HT turned on. > > But, I have a single process, single-threaded application, so there is > not much > scheduling to be done. If you have a large number of threads or processes, > then it would make more sense for turning off HT to have an affect.
This effect appeared on 1 task and on 200 tasks. I dont know what it is, but with HT off it doesnt appear anymore. The slow-down still appears when lower_zone_protection is set to 0 but the peak at 80 MB disappeared when set to 1024. I am now running at 95 MB/Sec smoothly.
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