> ________________________________________ > Von: Or Gerlitz [[email protected]] > Gesendet: Dienstag, 29. Oktober 2013 09:31 > An: Markus Stockhausen; [email protected]; Yishai Hadas > Cc: [email protected]; Erez Shitrit; Saeed Mahameed > Betreff: Re: ACK behaviour difference LRO/GRO > > On 28/10/2013 21:34, Markus Stockhausen wrote: > > After some quite hard test iterations the problem seems to come from the > > IPoIB switch from LRO to GRO between kernels 2.6.37 and 2.6.38. > > > > I built a test setup with a 2.6.38 kernel and additionaly compiled a 2.6.37 > > ib_ipoib module against it. This way I can run a direct comparison > > between the old and new module. The major difference between the > > two version is inside the ipoib_ib_handle_rx_wc() function: > > > > 2.6.37: lro_receive_skb(&priv->lro.lro_mgr, skb, NULL); > > 2.6.38: napi_gro_receive(&priv->napi, skb); > > These two commits that went in 3.3 > > 936d7de IPoIB: Stop lying about hard_header_len and use skb->cb to stash > LL addresses > a0417fa net: Make qdisc_skb_cb upper size bound explicit > > were supposed to make IPoIB/GRO to work properly, specifically with > them, you should see aggregation coming into play > > I think Yishai Hadas from Mellanox was looking on that too, do we have > any insights on the matter? > > Or.
At least for the 2.6.38 that sounds clear. My initial post was about 3.5. and 3.10 test kernels that showed the missing aggregation. So I'm still a bit away from a solution. I will try to get the test machine back to 3.10/3.11 to validate it once again. Just to be on the right way: What are the basics to get GRO working with a ConnectX (not 2 or 3) card in 2044 MTU datagram mode? - enable GRO with ethtool. - Activate Coalescing with ethtool? If yes how? Thanks for the help. Markus
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