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Date:   Tue, 12 Dec 2023 11:15:01 -0500
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Jason Wang <jasowang@redhat.com>
Cc:     Tobias Huschle <huschle@linux.ibm.com>,
        Abel Wu <wuyun.abel@bytedance.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        kvm@vger.kernel.org, virtualization@lists.linux.dev,
        netdev@vger.kernel.org
Subject: Re: Re: Re: EEVDF/vhost regression (bisected to 86bfbb7ce4f6
 sched/fair: Add lag based placement)
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On Tue, Dec 12, 2023 at 11:00:12AM +0800, Jason Wang wrote:
> On Tue, Dec 12, 2023 at 12:54 AM Michael S. Tsirkin <mst@redhat.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

You mean for debugging, add it with a patch to see what this does?

Sure - can you post the debugging patch pls?

> >
> > --
> > MST
> >