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Message-ID: <CAKgT0UdBPYRnwAuOGhCBAJSRhdHcnw28Tznr0GPAtqe-JWFjTQ@mail.gmail.com>
Date: Wed, 9 Oct 2019 15:44:06 -0700
From: Alexander Duyck <alexander.duyck@...il.com>
To: Josh Hunt <johunt@...mai.com>
Cc: Netdev <netdev@...r.kernel.org>,
Willem de Bruijn <willemb@...gle.com>,
intel-wired-lan <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [PATCH 0/3] igb, ixgbe, i40e UDP segmentation offload support
On Wed, Oct 9, 2019 at 3:08 PM Josh Hunt <johunt@...mai.com> wrote:
>
> Alexander Duyck posted a series in 2018 proposing adding UDP segmentation
> offload support to ixgbe and ixgbevf, but those patches were never
> accepted:
>
> https://lore.kernel.org/netdev/20180504003556.4769.11407.stgit@localhost.localdomain/
>
> This series is a repost of his ixgbe patch along with a similar
> change to the igb and i40e drivers. Testing using the udpgso_bench_tx
> benchmark shows a noticeable performance improvement with these changes
> applied.
>
> All #s below were run with:
> udpgso_bench_tx -C 1 -4 -D 172.25.43.133 -z -l 30 -u -S 0 -s $pkt_size
>
> igb::
>
> SW GSO (ethtool -K eth0 tx-udp-segmentation off):
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 120143.64 113 81263 81263 83.55 1.35
> 2944 120160.09 114 40638 40638 62.88 1.81
> 5888 120160.64 114 20319 20319 43.59 2.61
> 11776 120160.76 114 10160 10160 37.52 3.03
> 23552 120159.25 114 5080 5080 34.75 3.28
> 47104 120160.55 114 2540 2540 32.83 3.47
> 61824 120160.56 114 1935 1935 32.09 3.55
>
> HW GSO offload (ethtool -K eth0 tx-udp-segmentation on):
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 120144.65 113 81264 81264 83.03 1.36
> 2944 120161.56 114 40638 40638 41 2.78
> 5888 120160.23 114 20319 20319 23.76 4.79
> 11776 120161.16 114 10160 10160 15.82 7.20
> 23552 120156.45 114 5079 5079 12.8 8.90
> 47104 120159.33 114 2540 2540 8.82 12.92
> 61824 120158.43 114 1935 1935 8.24 13.83
>
> ixgbe::
> SW GSO:
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 1070565.90 1015 724112 724112 100 10.15
> 2944 1201579.19 1140 406342 406342 95.69 11.91
> 5888 1201217.55 1140 203185 203185 55.38 20.58
> 11776 1201613.49 1140 101588 101588 42.15 27.04
> 23552 1201631.32 1140 50795 50795 35.97 31.69
> 47104 1201626.38 1140 25397 25397 33.51 34.01
> 61824 1201625.52 1140 19350 19350 32.83 34.72
>
> HW GSO Offload:
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 1058681.25 1004 715954 715954 100 10.04
> 2944 1201730.86 1134 404254 404254 61.28 18.50
> 5888 1201776.61 1131 201608 201608 30.25 37.38
> 11776 1201795.90 1130 100676 100676 16.63 67.94
> 23552 1201807.90 1129 50304 50304 10.07 112.11
> 47104 1201748.35 1128 25143 25143 6.8 165.88
> 61824 1200770.45 1128 19140 19140 5.38 209.66
>
> i40e::
> SW GSO:
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 650122.83 616 439362 439362 100 6.16
> 2944 943993.53 895 319042 319042 100 8.95
> 5888 1199751.90 1138 202857 202857 82.51 13.79
> 11776 1200288.08 1139 101477 101477 64.34 17.70
> 23552 1201596.56 1140 50793 50793 59.74 19.08
> 47104 1201597.98 1140 25396 25396 56.31 20.24
> 61824 1201610.43 1140 19350 19350 55.48 20.54
>
> HW GSO offload:
> $pkt_size kB/s(sar) MB/s Calls/s Msg/s CPU MB2CPU
> ========================================================================
> 1472 657424.83 623 444653 444653 100 6.23
> 2944 1201242.87 1139 406226 406226 91.45 12.45
> 5888 1201739.95 1140 203199 203199 57.46 19.83
> 11776 1201557.36 1140 101584 101584 36.83 30.95
> 23552 1201525.17 1140 50790 50790 23.86 47.77
> 47104 1201514.54 1140 25394 25394 17.45 65.32
> 61824 1201478.91 1140 19348 19348 14.79 77.07
>
> I was not sure how to proper attribute Alexander on the ixgbe patch so
> please adjust this as necessary.
For the ixgbe patch I would be good with:
Suggested-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
The big hurdle for this will be validation. I know that there are some
parts such as the 82598 in the case of the ixgbe driver or 82575 in
the case of igb that didn't support the feature, and I wasn't sure
about the parts supported by i40e either. From what I can tell the
x710 datasheet seems to indicate that it is supported, and you were
able to get it working with your patch based on the numbers above. So
that just leaves validation of the x722 and making sure there isn't
anything firmware-wise on the i40e parts that may cause any issues.
Thanks.
- Alex
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