On Sun, Dec 28, 2014 at 08:25:40AM -0800, Dave Taht wrote: > On Sun, Dec 28, 2014 at 6:57 AM, Beniamino Galvani <b.galv...@gmail.com> > wrote: > > Add support for Byte Queue Limits to the STMicro MAC driver. > > Thank you! > > > Tested on a Amlogic S805 Cortex-A5 board, where the use of BQL > > slightly decreases the ping latency from ~10ms to ~3ms when the > > 100Mbps link is saturated by TCP streams. No difference is > > observed at 1Gbps. > > I see the plural. With TSQ in place it is hard (without something like > the rrul test driving multiple streams) to drive a driver to > saturation with small numbers of flows. This was with pfifo_fast, not > sch_fq, at 100mbit?
Hi Dave, yes, this was with pfifo_fast and I used 4 iperf TCP streams. The total throughput didn't seem to increase adding more streams. > > Can this board actually drive a full gigabit in the first place? Until > now most of the low end arm boards I have seen only came with > a 100mbit mac, and the gig ones lacking offloads seemed to peak > out at about 600mbit. I measured a throughput of 650mbit in rx and 600mbit in tx. > > Under my christmas tree landed a quad core A5 (odroid-c1), also an > xgene and zedboard - both of the latter are a-needing BQL, > and I haven't booted the udroid yet. Hopefully it is the > same driver you just improved. I'm using the odroid-c1 too, with this tree based on the recent Amlogic mainline work: https://github.com/bengal/linux/tree/meson8b Unfortunately at the moment the support for the board is very basic (for example, SMP is not working yet) but it's enough to do some NIC tests. Beniamino -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
