Messages in this thread | | | Subject | Re: Regression: Approximate 34% performance hit in receive throughput over ixgbe seen due to build_skb patch | From | William Kucharski <> | Date | Tue, 22 May 2018 13:29:53 -0600 |
| |
> On May 22, 2018, at 12:23 PM, Alexander Duyck <alexander.duyck@gmail.com> wrote: > > 3. There should be a private flag that can be updated via "ethtool > --set-priv-flags" called "legacy-rx" that you can enable that will > roll back to the original that did the copy-break type approach for > small packets and the headers of the frame.
With legacy-rx enabled, most of the regression goes away, but it's still present as compared to the code without the patch; the regression then drops to about 6%:
# ethtool --show-priv-flags eno1 Private flags for eno1: legacy-rx: on
Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec
65536 64 60.00 35934709 0 306.64 65536 60.00 33791739 288.35
Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec
65536 64 60.00 39254351 0 334.97 65536 60.00 36761069 313.69
Is this variance to be expected, or do you think modification of the interrupt delay would achieve better results?
William Kucharski
| |