netdev - Re: [PATCH net-next] virtio_net: force_napi

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Message-Id: <20180729.133636.8234343672255084.davem@davemloft.net>
Date:   Sun, 29 Jul 2018 13:36:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mst@...hat.com
Cc:     caleb.raitto@...il.com, jasowang@...hat.com,
        netdev@...r.kernel.org, caraitto@...gle.com
Subject: Re: [PATCH net-next] virtio_net: force_napi_tx module param.

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Sun, 29 Jul 2018 23:33:20 +0300

> The point really is that tx irq handler needs a lock on the tx queue to
> free up skbs, so processing it on another CPU while tx is active causes
> cache line bounces. So we want affinity to CPUs that submit to this
> queue on the theory they have these cache line(s) anyway.
> 
> I suspect it's not a uniqueue property of virtio.

It certainly is not.

I think the objectives are clear, someone just needs to put them
together cleanly into a patch :)