On Wed, 13 Sep 2000, Benno Senoner wrote: > Hi folks, > I benchmarked Ingo's lowlatency-2.4.0-test7-A0 kernel > (http://people.redhat.com/mingo/lowlatency-patches/lowlatency-2.4.0-test7-A0) > > I can only say that it looks VERY promising ( < 1msec latencies !) > But there seems to be problems with the kernel disk sync code: > After the disk stress test, I call the "sync" command, but unfortunately > the sync process hangs and eats 100% of the CPU (but no kernel crash) I also had similar problems with with not being able to complete the tests because of the sync call hanging. The tests that did finish looked really good though! > > see the graph here: > http://www.linuxdj.com/latency/2.4.0-test7-lowlatency-A0/2048.html Looks alot like the graphs I got. > (disk copy and disk read tests are missing because, of the hanging sync) > > Is this perhaps related to the truncate bug fixed in -test8 ? > > Ingo, any ideas what the cause of the hang could be ? > (let us know please when you port the patch to test8) Yes, definitely! Chris| > > Anyway if the remaining bugs can be fixed, then I think that that > all low latency needs of 2.4 users will be satisfied. > (my reference mark is being able to stay below 1.5 - 2msec, which > is needed for perceptually delayfree realtime audio processing) > > PS: looking at the results Chris posted, > http://cygnus.ipal.org/results-2.4.0t8-ll/3x256.html > Andrew's minimalistic approach looks promising too and seems to > be able to guarantee <5msec latencies under high load. > > cheers, > Benno. > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/
