Xiaodong, That tip about LCP is a good one - the tap interfaces you created (or that linux-cp created for you) will be in polling mode. virtio/tap does allow for adaptive as well. And indeed, even if my physical interfaces (Intel X710 10G and Intel i810 100G) are showing adaptive mode, the tap is still polling.
For me: set int state GigabitEthernet3/0/0 up set int state GigabitEthernet3/0/1 up set int state HundredGigabitEthernet12/0/0 up set int state HundredGigabitEthernet12/0/1 up set int rx-mode GigabitEthernet3/0/0 adaptive set int rx-mode GigabitEthernet3/0/1 adaptive set int rx-mode HundredGigabitEthernet12/0/0 adaptive set int rx-mode HundredGigabitEthernet12/0/1 adaptive lcp create GigabitEthernet3/0/0 host-if e0 set int rx-mode tap1 adaptive (and ensure all other taps and phys are in adaptive) the load goes from 300% to 19% on a machine with 3 workers. So, in your case possibly the tap was still being polled? groet, Pim On Wed, Jul 20, 2022 at 10:43 PM Mohsin Kazmi via lists.fd.io <sykazmi= cisco....@lists.fd.io> wrote: > Hi Xiaodong, > > > > What is the output of *show int rx-placement* > > > > -br > > Mohsin > > > > *From: *<vpp-dev@lists.fd.io> on behalf of Xiaodong Xu < > stid.s...@gmail.com> > *Reply-To: *"vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io> > *Date: *Wednesday, July 20, 2022 at 8:44 PM > *To: *"vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io> > *Subject: *[vpp-dev] CPU usage for vpp > > > > Hi, > > > > When I start vpp, the CPU usage will be close to 100% on the core that vpp > is running on. I know this is normal because dpdk is running in poll mode. > > However when I set the rx-mode to 'interrupt', it doesn't make any > difference. The command line I use looks like: > > > > # set interface rx-mode [ifname] interrupt > > > > Did I miss anything? Thanks for your attention and any suggestions are > welcome. > > > > Regards, > > Xiaodong > > > > > > -- Pim van Pelt <p...@ipng.nl> PBVP1-RIPE - http://www.ipng.nl/
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