linux-kernel - Re: Re: Re: EEVDF/vhost regression (bisected to 86bfbb7ce4f6 sched/fair: Add lag based placement)

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Message-ID: <CACGkMEudZnF7hUajgt0wtNPCxH8j6A3L1DgJj2ayJWhv9Bh1WA@mail.gmail.com>
Date:   Tue, 12 Dec 2023 11:00:12 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Tobias Huschle <huschle@...ux.ibm.com>,
        Abel Wu <wuyun.abel@...edance.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        kvm@...r.kernel.org, virtualization@...ts.linux.dev,
        netdev@...r.kernel.org
Subject: Re: Re: Re: EEVDF/vhost regression (bisected to 86bfbb7ce4f6
 sched/fair: Add lag based placement)

On Tue, Dec 12, 2023 at 12:54 AM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Mon, Dec 11, 2023 at 03:26:46PM +0800, Jason Wang wrote:
> > > Try reducing the VHOST_NET_WEIGHT limit and see if that improves things any?
> >
> > Or a dirty hack like cond_resched() in translate_desc().
>
> what do you mean, exactly?

Ideally it should not matter, but Tobias said there's an unexpectedly
long time spent on translate_desc() which may indicate that the
might_sleep() or other doesn't work for some reason.

Thanks

>
> --
> MST
>