Date: Tue, 4 Feb 2020 01:23:21 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Navdeep Parhar <np@FreeBSD.org> Cc: freebsd-net@freebsd.org Subject: Re: Chelsio NETMAP performance Message-ID: <20200203222321.GB8012@zxy.spb.ru> In-Reply-To: <863de9e1-42cc-6f3a-5c1f-1bf737714c9f@FreeBSD.org> References: <20200203201728.GC8028@zxy.spb.ru> <863de9e1-42cc-6f3a-5c1f-1bf737714c9f@FreeBSD.org>
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On Mon, Feb 03, 2020 at 01:39:52PM -0800, Navdeep Parhar wrote:
> On 2/3/20 12:17 PM, Slawa Olhovchenkov wrote:
> > I am try to use Chelsio T540-CR in netmap mode and see poor (compared
> > to Intel 82599ES) performance.
>
> What approximate FreeBSD version is this?
12.1-STABLE
> >
> > Same application ac receive only about 8.9Mpss, compared to 12.5Mpps
> > at Intel.
> >
> > pmc profile show mostly time spend in:
> >
> > 49.76% [17802] service_nm_rxq @ /boot/kernel/if_cxgbe.ko
> > 100.0% [17802] t4_vi_intr
> > 100.0% [17802] ithread_loop @ /boot/kernel/kernel
> > 100.0% [17802] fork_exit
> >
> >
> > to be exact at line
> >
> > while ((d->rsp.u.type_gen & F_RSPD_GEN) == nm_rxq->iq_gen) {
> >
> > Is this maximum limit for this vendor?
>
> No, a T540 should be able to sink full 10Gbps (14.88Mpps) on a single rx
> queue. Try adding this to your loader.conf:
>
> hw.cxgbe.toecaps_allowed="0"
>
> Then try simple netmap "pkt-gen -f rx" instead of any custom app and see
> how many pps it's able to sink.
Thanks! `hw.cxgbe.toecaps_allowed="0"` allow recive 14Mpps for may
application too!
Now I am got only 10% less performance compared to Intel, as I see by
higher Chelsio interrupt cpu time (top show about 30% for every
interrupt handler). Is this normal? Is this posible to optimize?
This is interrupt rate I see:
54651 t5nex0:3b0
56475 t5nex0:3b1
55181 t5nex0:3b2
56577 t5nex0:3b3
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