Il 28/04/2013 13:45, Luca dariz ha scritto: > Il 26/04/2013 22:00, Luca dariz ha scritto: >> Il 26/04/2013 16:35, Conor O'Gorman ha scritto: >>> On Fri, 2013-04-26 at 14:13 +0200, Luca dariz wrote: >>>> Use a tasklet to handle incoming packets. Fix #12917. >>>> >>>> Incoming packets are now processes in a tasklet instead of in the >>>> irq handler; this should improve latency. >>>> >>>> This patch is based on a previous version of ltq-atm driver, which >>>> did implement a tasklet. >>>> >>>> It has been tested on a arv4518pw with a >>>> Lantiq Danube for about a month and it seems to work well. >>> >>> And how much 'better' is it? >>> >> >> I did't measure latency with this patch and without it, so i can't tell >> exactly. >> >> Luca > > A quick test with cyclictest > (https://rt.wiki.kernel.org/index.php/Cyclictest): > > without the patch: > > cmdline: ./cyclictest -n > # /dev/cpu_dma_latency set to 0us > policy: other/other: loadavg: 0.51 0.33 0.27 1/43 3241 > T: 0 ( 3241) P: 0 I:1000 C: 144288 Min: 40 Act: 93 Avg: 163 Max: 4456 > > with the patch: > > cmdline: ./cyclictest -n > # /dev/cpu_dma_latency set to 0us > policy: other/other: loadavg: 0.78 0.44 0.22 1/44 4981 > T: 0 ( 3452) P: 0 I:1000 C: 82427 Min: 39 Act: 199 Avg: 252 Max: 18179 > > All latencies are measures in microseconds. > > Luca
I forgot: during the test, a big download was in progress, to stress the rx path a bit. Luca _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
