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["mc36" <>]

documenting....


-------- Forwarded Message --------
Subject: Re: freeRouter rpms for CentOS and Fedora
Date: Tue, 8 Feb 2022 17:54:57 +0200
From: 
To: 

Hi Csaba,

If I add to vpp option "poll-sleep-usec 10" then vpp_main consumes
4.7% CPU without traffic and 95% when I run iperf3. Results with and
without this option the same. Results with virtio-net-pci better 2.4
Gbits/sec (with virtio-net-pci  p4dpdk hangs after some time).

Without traffic when p4dpdk consumes 13% CPU qemu process consumes
100% (the same with vpp).

> if you do iperf on multiple sessions and you see same results
If I run iperf3 with 2 streams results the same for vpp and p4dodk.

Cheers.
Alexey

2022-02-08 15:31 GMT+02:00, mc36 <>:
> hi,
> thanks for pushing further! first of all, both are laughingly low numbers,
> but meh...
> my idea is that vpp does not sleeps (both the host and the vm uses constant
> 100%)
> whereas p4dpdk does usleep if no packet for a while ( < 10% cpu on both host
> and vm)...
> but this obviously results in some delays, and the throughput=bw*delay
> answers the rest...
> if you do iperf on multiple sessions and you see same results (step 1),
> (step 2) then p4dpdk have a magic knob (-10 par 0) to set usleep's
> parameters,
> and as far as i know, invalid values will return immediately... if not,
> i'll
> quickly add the extra if...
> regards,
> cs
>
>
> On 2/8/22 14:21,  wrote:
> > Hi Csaba,
> >
> > I compared simple iperf3 results for vpp and freerouter (two iperf3
> > run on host, traffic forwarded between two interfaces in vm with
> > e1000e nic's, mtu 1500).
> >
> > For vpp (using one core) results are better than for freerouter with
> > p4dpdk
> > vpp - 2.2 Gbit/s, freerouter - 1.8 Gbit/s
> >
> > If I add to p4dpdk options 0 0 1  1 2 3  -1 4 4 then result mostly the
> > same (1.8 without this options and 1.85 with options).
> >
> > Do you have any idea why vpp give better result?
> >
> > I tried to add kernel parameter isolcpus=1-4 recommended for vpp but
> > p4dpdk with 0 1 2  1 3 4 does not work.
> >
> > After adding parameter -2 8192 0 ping -s 8150 works but further
> > increase of this parameter does not allow increasing the packet size
> > more than 8150.
> >
> > Cheers.
> > Alexey
> >
> > 2022-02-03 10:14 GMT+02:00, mc36 <>:
> > > hi,
> > >
> > > On 2/3/22 08:46, mc36 wrote:
> > > > i can't tell you any eta on this... :)
> > >
> > > the more i'm thinking about the stuff the more i hate the resulting code
> > > so
> > > for now all i did is noted the miss of this feature:
> > > https://github.com/mc36/freeRouter/commit/86ea1d96e8d8ce2aef79278394f4e1c794ac4b57
> > >
> > > basically i consider it under the same question as
> > > why freerouter even does not fragment ipv4 in even in software...
> > > and why ipv6 rfc declared to not fragment in the path...
> > >
> > > regards,
> > > cs


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