Messages in this thread |  | | From | Xin Long <> | Date | Mon, 3 Oct 2016 10:32:04 +0800 | Subject | Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2% regression |
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On Fri, Sep 30, 2016 at 3:05 PM, Aaron Lu <aaron.lu@intel.com> wrote: > On 08/23/2016 05:44 AM, Marcelo Ricardo Leitner wrote: >> Em 19-08-2016 04:24, Aaron Lu escreveu: >>> On Fri, Aug 19, 2016 at 04:19:39AM -0300, Marcelo Ricardo Leitner wrote: >>>> Hi, >>>> >>>> Em 19-08-2016 02:29, Aaron Lu escreveu: >>>> ... >>>>> It doesn't look insane and sctp_wait_for_sndbuf may actually have >>>>> something to do with a larger sctp_chunk I suppose? >>>>> >>>>> The same perf record doesn't capture any sample for the good commit, >>>>> which suggests the nerperf process doesn't sleep in sctp_wait_for_sndbuf. >>>> >>>> Ahhh yes! It does, and then it would mean your txbuf is too small for the >>>> chunk sizes you're using (sctp tests option -m). >>>> >>>> What's your netperf cmdline again please? >>> >>> netperf -4 -t SCTP_STREAM_MANY -c -C -l 300 -- -m 10K -H 127.0.0.1 >>> >>> Is the 10K used here a problem? If so, can you suggest a proper value >>> for our netperf performance test? Thanks. >> >> We're still working on this. Xin could reproduce it on an i3 too, but >> I'm afraid this commit just unmasked an issue in there. You're >> overloading the CPU by too much when spawning 8 parallel netperf's on a >> 4-core system, seems that commit a6c2f79287 was that last rock that made >> it slip into a precipice. sctp's cwnd and rwnd management are not as >> good as tcp's and now it seems you're triggering a corner case. >> >> I hope to have more soon. > > I wonder if there is any update on this issue? > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
be4947b sctp: change to check peer prsctp_capable when using prsctp polices 0605483 sctp: remove prsctp_param from sctp_chunk 73dca12 sctp: move sent_count to the memory hole in sctp_chunk
These three commit can avoid this issue by recovering sctp_chunk size.
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