Hi leetminiwheat, On Apr 15, 2015, at 03:35 , leetminiwheat <[email protected]> wrote:
> On Mon, Apr 13, 2015 at 5:39 PM, Sebastian Moeller <[email protected]> wrote: >> This looks reasonable. >> >>> [...] >> >> I had a look at my cerowrt router and I also see txqueuelen at 1000, >> but IIRC that does not matter much anymore, since the wndr37/800 support BQL: >> cat /sys/class/net/ge00/queues/tx-0/byte_queue_limits/limit_max >> 3000 >> So even with txqueuelen = 1000 the tx queue will only hold 3000 bytes. For >> fib and friends it does not really matter as far as I can tell. > > Interesting, I had been reading about BQL but didn't fully understand > it until now. This clears up a lot of confusion, thank you. > > I assume tweaking ring parameters from default RX:128 and TX:32 > doesn't matter anymore thenr? As far as I know we leave that alone, see: http://www.bufferbloat.net/projects/bloat/wiki/Linux_Tips: “Set the size of the ring buffer for the network interface NOTE: THIS HACK IS NO LONGER NEEDED on many ethernet drivers in Linux 3.3, which has Byte Queue Limits instead, which does a far better job." > >> [...] >> If you have time and netperf-wrapper it would be good to convince yourself >> and us again, that txqueuelen really does not matter for BQL’d interfaces by >> running RRUL tests with and without your modifications…. > > Will do if I can get a friend to set up a netperf server in a node at > his datacenter he works at, though I believe he's using Debian Jessy > without any kind of QoS, but his datacenter routers might screw with > the packets. Maybe I can hook a spare box up to the WAN port > temporarily to test with. Ah, there are three netperf servers out there that, as far as I know, we are allowed to use: netperf-west.bufferbloat.net netperf-east.bufferbloat.net netperf-eu.bufferbloat.net My guess is the last one should be closest to you, and should do at least for initial tests. Having a faster closer netperf server available certainly is even more attractive. Best Regards Sebastian _______________________________________________ Cerowrt-devel mailing list [email protected] https://lists.bufferbloat.net/listinfo/cerowrt-devel
