On Mon 2015-09-28 09:41:43, Johannes Berg wrote: > On Sat, 2015-09-26 at 12:24 +0200, Pavel Machek wrote: > > > > That would be equivalent to ping -Q, right? It does not seem to have > > any effect :-(. I'd expect at least local machine to use shorter waits > > for medium, and thus drop packets instead of waiting. > > Correct. But it won't *drop* packets, it just increases the chances of > getting medium access. Increases chances of medium access, but limits number of retries, so it should drop sooner, no? > > > # you have to add some magic for matching your data > > > e.g. $IPT -t mangle -I OUTPUT -j DSCP --set-dscp-class CS7 > > > > Again, this is ping -Q equivalent, right? I was doing > > Yes. > > > ping -c 300 -i .2 -Q $[56*4] -s 500 amd > > 300 packets transmitted, 300 received, 0% packet loss, time 60989ms > > rtt min/avg/max/mdev = 2.155/8.599/44.475/5.677 ms > > 300 packets transmitted, 300 received, +1 duplicates, 0% packet loss, time 61030ms > > rtt min/avg/max/mdev = 2.158/23.809/300.956/49.969 ms, pipe 2 > > > > I would expect packet loss, but got long delays instead. > > See above :) > > > > also you should consider force the ACK-timing to 450m / Class1 > > > and forbid retransmission in minstrel > > > > Yes, disabling retransmission would be useful. How would I do that? > > > It won't work on Intel devices though since they don't use > minstrel(_ht) I'm using ath5k for testing... that should use minstrel AFAICT. 02:02.0 Ethernet controller: Qualcomm Atheros AR5211 Wireless Network Adapter [AR5001X 802.11ab] (rev 01) I'm now trying: # Background load sudo ping -f amd -s 8000 # Test ping -c 30 -i .2 -Q $[0*4] -s 500 amd ping -c 30 -i .2 -Q $[40*4] -s 500 amd ping -c 30 -i .2 -Q $[56*4] -s 500 amd This should send the second ping to the priority queue based on -Q, but I don't see an effect against one access point.... and it seems to work somehow against second one. Good! avg/maximum latency goes from 8/24 (-Q $[40*4]) to 80/258 (same settings, every second frame is slow?!) to 8/26 to 7/32 to 6/18. But this jumps to 92/123, 95/139, 91/128 and 135/678 with (-Q 0). -Q $[56*4] produces 6/10, 8/23, 6/14, 5/9, 5/14. Good. Thanks! Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
