On 9/2/11 2:09 PM, Michael Büsch wrote: > On Fri, 2 Sep 2011 00:55:54 +0200 > Luka Perkov <open...@lukaperkov.net> wrote: > >> Also in linux-2.6.39.4/kernel/Kconfig.preempt you will see for >> CONFIG_PREEMPT: >> >> Select this if you are building a kernel for a desktop or >> embedded system with latency requirements in the milliseconds >> range >> >> Because of that I made changes to all kernel config files. >> >> Signed-off-by: Luka Perkov < openwrt ->-to->- lukaperkov.net > > > Uhm, wait a second. > What are you actually trying to fix with enabling preemption? I didn't > really get it by reading your mail. > > Some random text in a kernel config file is _not_ a reason to make > a change with a scope like this one. > Enabling preemption _does_ have negative effects. For one it increases > the kernel size. And it also increases the runtime overhead (especially on > UP). > > And finally, I'm not really convinced that any of the routers/APs > that OpenWRT supports have "latency requirements in the milliseconds range". > I'd rather say throughput matters a _lot_ more than a millisecond of latency > for these devices.
If you're doing VoIP, then I'd certainly say latency matters. -Philip _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
