On 21 March 2016 at 18:10, Dave Taht <dave.taht@xxxxxxxxx> wrote: > thx. > > a lot to digest. > > A) quick notes on "flent-gui bursts_11e-2016-03-21T09*.gz" > > 1) the new bursts_11e test *should* have stuck stuff in the VI and VO > queues, and there *should* have been some sort of difference shown on > the plots with it. There wasn't. traffic-gen generates only BE traffic. Everything else runs UDP_RR which doesn't generate a lot of traffic. > For diffserv markings I used BE=CS0, BK=CS1, VI=CS5, and VO=EF. > CS6/CS7 should also land in VO (at least with the soft mac handler > last I looked). Is there a way to check if you are indeed exercising > all four 802.11e hardware queues in this test? in ath9k it is the > "xmit" sysfs var.... Hmm.. there are no txq stats. I guess it makes sense to have them? There is /sys/kernel/debug/ieee80211/phy*/fq which dumps state of all queues which will be mostly empty with UDP_RR. You can run netperf UDP stream with diffserv marking to see onto which tid they are mapped. You can see tid-AC mappings here: https://wireless.wiki.kernel.org/en/developers/documentation/mac80211/queues I just checked and EF ends up as tid5 which is VI. It's actually the same as CS5. You can use CS7 to run on tid7 which is VO. > 2) In all the old cases the BE UDP_RR flow died on the first burst > (why?), and the fullpatch preserved it. I think it's related to my setup which involves veth pairs. I use them to simulate bridging/AP behavior but maybe it's not doing the job right, hmm.. > (I would have kind of hoped to > have seen the BK flow die, actually, in the fullpatch) There's no extra weight priority to BK. The difference between BE and BK in 802.11 is contention window access time so BK gets less txops statistically. Both share the same txop, which is 5.484ms in most cases. > 3) I am also confused on 802.11ac - can VO aggregate? ( can't in in 802.11n). Yes, it should be albeit VI and VO have shorter txop compared to BE/BK: 3.008ms and 1.504ms respectively. UDP_RR doesn't really create a lot of opportunities for aggregation. If you want to see how different queues behave when loaded you'll need to modify traffic-gen and add bursts across different ACs in the bursts_11e test. Michał -- 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
