On 07/16/2013 04:50 PM, Pravin Shelar wrote: > On Tue, Jul 16, 2013 at 12:53 PM, Joseph Salisbury > <joseph.salisb...@canonical.com> wrote: >> On 07/16/2013 02:29 PM, Pravin Shelar wrote: >>> On Tue, Jul 16, 2013 at 11:09 AM, Joseph Salisbury >>> <joseph.salisb...@canonical.com> wrote: >>>> Hi Pravin, >>>> >>>> A bug was opened against the Ubuntu kernel[0]. After a kernel bisect, >>>> it was found that reverting the following commit resolved this bug: >>>> >>>> commit ec5f061564238892005257c83565a0b58ec79295 >>>> Author: Pravin B Shelar <pshe...@nicira.com> >>>> Date: Thu Mar 7 09:28:01 2013 +0000 >>>> >>>> net: Kill link between CSUM and SG features. >>>> >>>> >>>> The regression was introduced as of v3.10-rc1. >>>> >>>> I see that you are the author of this patch, so I wanted to run this by >>>> you. I was thinking of requesting a revert for v3.11, but I wanted to >>>> get your feedback first. >>>> >>>> >>> This issue was reported before and turning off sg solves problem for >>> HyperV driver. Drivers (intel and bnx2x) that I tested works fine with >>> this patch. Have you seen the issue on any other NIC? >> Thanks for the feedback. We have only seen it on Intel hardware. Can >> you send a pointer to the patch? If so, we can provide some additional >> testing. Do you plan on submitting the patch for inclusion in 3.11? >> >> > What I mean is I do not see any problem with the patch that you have > pointed out on ixgbe and bnx2x platforms. HyperV problem went away > with disabling sg by ethtool utility. Yes, we also see that the problem goes away when disabling sg with ethtool. There was a significant improvement in throughput with sg enabled, so it's unfortunate it must be disabled.
> > Can you also give me more information about regression you are seeing > like driver name, features of the NIC set and features of device > without this patch. Does any other NIC than HyperV having this issue? Some details info about the HyperV guest can be seen here: http://paste.ubuntu.com/5884549/ In that output, you will see that scatter-gather is off, which was done manually. Only a HyperV NIC is having this issue. > > Thanks. > >>> >>>> Thanks, >>>> >>>> Joe >>>> >>>> [0] http://pad.lv/1200243 >>>> >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe netdev" in >>>> the body of a message to majord...@vger.kernel.org >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
