netdev - Re: [PATCH net] virtio-net: suppress bad irq warning for tx napi

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Message-ID: <CAA93jw4z7W6uUYKn5SdZ+Ci1tr1NrtCbhkkmua5xwfGA=V-8pQ@mail.gmail.com>
Date:   Thu, 30 Sep 2021 11:10:33 -0700
From:   Dave Taht <dave.taht@...il.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net] virtio-net: suppress bad irq warning for tx napi

To me, the symptoms of this problem (a packet storm) smelt like the
lack of bql leading to very bursty tcp behavior
and enormous tcp RTT inflation in this driver which I observed 6+ months back.

now that it seems to be fixed (?), could you re-run the netperf 128
stream test and share a packet capture? (try with pfifo_fast or
fq_codel
at the qdisc), and sch_fq as a control (which was working correctly).

thx.