Messages in this thread | | | Subject | Re: [PATCH RFC 0/7] add socket to netdev page frag recycling support | From | David Ahern <> | Date | Wed, 18 Aug 2021 16:05:52 -0600 |
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On 8/17/21 9:32 PM, Yunsheng Lin wrote: > This patchset adds the socket to netdev page frag recycling > support based on the busy polling and page pool infrastructure. > > The profermance improve from 30Gbit to 41Gbit for one thread iperf > tcp flow, and the CPU usages decreases about 20% for four threads > iperf flow with 100Gb line speed in IOMMU strict mode. > > The profermance improve about 2.5% for one thread iperf tcp flow > in IOMMU passthrough mode. >
Details about the test setup? cpu model, mtu, any other relevant changes / settings.
How does that performance improvement compare with using the Tx ZC API? At 1500 MTU I see a CPU drop on the Tx side from 80% to 20% with the ZC API and ~10% increase in throughput. Bumping the MTU to 3300 and performance with the ZC API is 2x the current model with 1/2 the cpu.
Epyc 7502, ConnectX-6, IOMMU off.
In short, it seems like improving the Tx ZC API is the better path forward than per-socket page pools.
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