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

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Message-ID: <20240319042829-mutt-send-email-mst@kernel.org>
Date: Tue, 19 Mar 2024 04:29:33 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Tobias Huschle <huschle@...ux.ibm.com>
Cc: Luis Machado <luis.machado@....com>, Jason Wang <jasowang@...hat.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,
	nd <nd@....com>
Subject: Re: EEVDF/vhost regression (bisected to 86bfbb7ce4f6 sched/fair: Add
 lag based placement)

On Tue, Mar 19, 2024 at 09:21:06AM +0100, Tobias Huschle wrote:
> On 2024-03-15 11:31, Michael S. Tsirkin wrote:
> > On Fri, Mar 15, 2024 at 09:33:49AM +0100, Tobias Huschle wrote:
> > > On Thu, Mar 14, 2024 at 11:09:25AM -0400, Michael S. Tsirkin wrote:
> > > >
> > 
> > Could you remind me pls, what is the kworker doing specifically that
> > vhost is relying on?
> 
> The kworker is handling the actual data moving in memory if I'm not
> mistaking.

I think that is the vhost process itself. Maybe you mean the
guest thread versus the vhost thread then?