Re: [Flent-users] [tohojo/flent] RRUL Upload plot - why such low granularity? (#185)
Hi Toke, > On Sep 29, 2019, at 21:08, Toke Høiland-Jørgensen > wrote: > > flent-users writes: > > > Hi Toke, > > > >> On Sep 29, 2019, at 20:44, Toke Høiland-Jørgensen > >> wrote: > >> > >> Rich Brown writes: > >> > >> > Sorry for the delay in responding... The higher granularity makes much > >> > better plots (see below). > >> > >> Great! > >> > >> > Using `-m 2048,2048` I don't see a whole lot of load on my Mac 2.5 GHz > >> > Intel Core i7 at 7mbps/768kbps. Thanks. > >> > >> No, don't expect it would. The CPU usage thing will hit you at high > >> rates (I was testing on a gigabit link). > >> > >> I'm not sure we can realistically pick an option that works well for > >> both slow and fast links. So we may have to add a switch; and then the > >> problem becomes what to use for defaults... > > > > How about make it not a "switch" but a numeric parameter, and > > default to the current default value by principle of least > > surprise? > > Well, by "switch" I just meant "new command line option". Oops, sorry, I read this as a switch to toggle between say the default (which seems system dependent not petperf dependent, no?) and a value for low bandwidth links, say 1460... > The obvious > form of that would be, as you say, just the ability to set the netperf > xfer size directly... I guess that would be the best compromise, if the user knows about a links asymmetry the send and receive buffers can be sized accordingly like 16K, 1600 for DOCSIS down-/upload... I also wonder whether flent should not try to also record and parse /proc/stat to detect CPU overload (so the user could be warned/informed to increase the xfer size if there is danger of being CPU bound)? Best Regards Sebastian > — > You are receiving this because you commented. > Reply to this email directly, view it on GitHub, or mute the thread. > > ___ > Flent-users mailing list > Flent-users@flent.org > http://flent.org/mailman/listinfo/flent-users_flent.org ___ Flent-users mailing list Flent-users@flent.org http://flent.org/mailman/listinfo/flent-users_flent.org
Re: [Flent-users] [tohojo/flent] RRUL Upload plot - why such low granularity? (#185)
Rich Brown writes: > Sorry for the delay in responding... The higher granularity makes much > better plots (see below). Great! > Using `-m 2048,2048` I don't see a whole lot of load on my Mac 2.5 GHz > Intel Core i7 at 7mbps/768kbps. Thanks. No, don't expect it would. The CPU usage thing will hit you at high rates (I was testing on a gigabit link). I'm not sure we can realistically pick an option that works well for both slow and fast links. So we may have to add a switch; and then the problem becomes what to use for defaults... -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: https://github.com/tohojo/flent/issues/185#issuecomment-536329614___ Flent-users mailing list Flent-users@flent.org http://flent.org/mailman/listinfo/flent-users_flent.org
Re: [Flent-users] [tohojo/flent] RRUL Upload plot - why such low granularity? (#185)
flent-users writes: > Hi Toke, > >> On Sep 29, 2019, at 20:44, Toke Høiland-Jørgensen >> wrote: >> >> Rich Brown writes: >> >> > Sorry for the delay in responding... The higher granularity makes much >> > better plots (see below). >> >> Great! >> >> > Using `-m 2048,2048` I don't see a whole lot of load on my Mac 2.5 GHz >> > Intel Core i7 at 7mbps/768kbps. Thanks. >> >> No, don't expect it would. The CPU usage thing will hit you at high >> rates (I was testing on a gigabit link). >> >> I'm not sure we can realistically pick an option that works well for >> both slow and fast links. So we may have to add a switch; and then the >> problem becomes what to use for defaults... > > How about make it not a "switch" but a numeric parameter, and > default to the current default value by principle of least > surprise? Well, by "switch" I just meant "new command line option". The obvious form of that would be, as you say, just the ability to set the netperf xfer size directly... -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: https://github.com/tohojo/flent/issues/185#issuecomment-536331577___ Flent-users mailing list Flent-users@flent.org http://flent.org/mailman/listinfo/flent-users_flent.org
Re: [Flent-users] [tohojo/flent] RRUL Upload plot - why such low granularity? (#185)
Sorry for the delay in responding... The higher granularity makes much better plots (see below). Using `-m 2048,2048` I don't see a whole lot of load on my Mac 2.5 GHz Intel Core i7 at 7mbps/768kbps. Thanks. https://user-images.githubusercontent.com/1094930/65833956-1a950b00-e2a4-11e9-9353-b525b527b266.png;> -- You are receiving this because you commented. Reply to this email directly or view it on GitHub: https://github.com/tohojo/flent/issues/185#issuecomment-536307364___ Flent-users mailing list Flent-users@flent.org http://flent.org/mailman/listinfo/flent-users_flent.org
