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    SubjectRe: [openib-general] Re: TSO and IPoIB performance degradation
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    Date
    On Mon, 2006-03-06 at 19:13 -0800, Shirley Ma wrote:
    >
    > > More likely you are getting hit by the fact that TSO prevents the
    > congestion
    > window from increasing properly. This was fixed in 2.6.15 (around mid
    > of Nov 2005).
    >
    > Yep, I noticed the same problem. After updating to the new kernel, the
    > performance are much better, but it's still lower than before.

    Here is an updated version of OpenIB IPoIB performance for various
    kernels with and without one of the TSO patches. The netperf
    performance for the latest kernels has not improved the TSO performance
    drop.

    Any comments or suggestions would be appreciated.

    - Matt

    >
    All benchmarks are with RHEL4 x86_64 with HCA FW v4.7.0
    dual EM64T 3.2 GHz PCIe IB HCA (memfull)
    patch 1 - remove changeset 314324121f9b94b2ca657a494cf2b9cb0e4a28cc

    Kernel OpenIB msi_x netperf (MB/s)
    2.6.16-rc5 in-kernel 1 367
    2.6.15 in-kernel 1 382
    2.6.14-rc4 patch 1 in-kernel 1 434
    2.6.14-rc4 in-kernel 1 385
    2.6.14-rc3 in-kernel 1 374
    2.6.13.2 svn3627 1 386
    2.6.13.2 patch 1 svn3627 1 446
    2.6.13.2 in-kernel 1 394
    2.6.13-rc3 patch 12 in-kernel 1 442
    2.6.13-rc3 patch 1 in-kernel 1 450
    2.6.13-rc3 in-kernel 1 395
    2.6.12.5-lustre in-kernel 1 399
    2.6.12.5 patch 1 in-kernel 1 464
    2.6.12.5 in-kernel 1 402
    2.6.12 in-kernel 1 406
    2.6.12-rc6 patch 1 in-kernel 1 470
    2.6.12-rc6 in-kernel 1 407
    2.6.12-rc5 in-kernel 1 405
    2.6.12-rc5 patch 1 in-kernel 1 474
    2.6.12-rc4 in-kernel 1 470
    2.6.12-rc3 in-kernel 1 466
    2.6.12-rc2 in-kernel 1 469
    2.6.12-rc1 in-kernel 1 466
    2.6.11 in-kernel 1 464
    2.6.11 svn3687 1 464
    2.6.9-11.ELsmp svn3513 1 425 (Woody's results, 3.6Ghz
    EM64T)


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