well on the default load, it looks like you want the mls commands http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_37_ey/command/reference/cr.pdf
I imagine with the new tcp's pfifo_fast is going to be sub 8ms also. however what we are probably seeing with the measurement flows is slow start causing a whole bunch of packets to be lost in a bunch. Is your hardware fast enough to run tcpdump -s 128 -w whatever.cap -i your interface during an entire rrul test without dropping packets? (on client and server) On Thu, Mar 20, 2014 at 9:44 AM, Toke Høiland-Jørgensen <[email protected]> wrote: > Dave Taht <[email protected]> writes: > >> I find it puzzling that you still lose the measurement flows early on. >> Setting some QoS on via WTD might be interesting. > > Well if you can be more specific, I'll be happy to. Was looking for a > way to have per-protocol QoS settings, but there does not seem to be any > From the documentation (only IP-based). > >> If you have a later OS than 3.13 on the sources/sinks you might want >> to try sch_fq (and sch_pfifo_fast for reference) - the improvements to >> Linux's TCP are such that on a short path like this that the control >> loop stays very tight - only two TSO offloads per flow, really >> accurate use of tcp timestamps, etc. > > Added a result set with sch_fq in place of fq_codel to the bottom of the > same page. Doesn't appear to make much of a difference... > >> See also if you have hardware flow control enabled (via ethtool) > > If by that you mean pause frames, ethtool seems to think not: > > Settings for eth2: > Supported ports: [ TP ] > Supported link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Supported pause frame use: No > Supports auto-negotiation: Yes > Advertised link modes: 10baseT/Half 10baseT/Full > 100baseT/Half 100baseT/Full > 1000baseT/Full > Advertised pause frame use: No > Advertised auto-negotiation: Yes > Speed: 1000Mb/s > Duplex: Full > Port: Twisted Pair > PHYAD: 1 > Transceiver: internal > Auto-negotiation: on > MDI-X: off > Supports Wake-on: d > Wake-on: d > Current message level: 0x00000007 (7) > drv probe link > Link detected: yes > > > -Toke -- Dave Täht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
