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

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Date: Tue, 12 Dec 2023 11:15:01 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...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 11:00:12AM +0800, Jason Wang wrote:
> 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

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

Sure - can you post the debugging patch pls?

> >
> > --
> > MST
> >