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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: German Maglione <gmaglione@redhat.com>,
	virtualization@lists.linux-foundation.org,
	Jonas Pfefferle <JPF@zurich.ibm.com>,
	miklos@szeredi.hu
Subject: Re: virtio-fs: adding support for multi-queue
Date: Tue, 7 Feb 2023 16:32:02 -0500	[thread overview]
Message-ID: <Y+LDUmWyXCdPIriB@fedora> (raw)
In-Reply-To: <Y+KsVhIR9aEoSdRu@redhat.com>


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On Tue, Feb 07, 2023 at 02:53:58PM -0500, Vivek Goyal wrote:
> On Tue, Feb 07, 2023 at 02:45:39PM -0500, Stefan Hajnoczi wrote:
> > On Tue, Feb 07, 2023 at 11:14:46AM +0100, Peter-Jan Gootzen wrote:
> > > Hi,
> > > 
> 
> [cc German]
> 
> > > For my MSc thesis project in collaboration with IBM
> > > (https://github.com/IBM/dpu-virtio-fs) we are looking to improve the
> > > performance of the virtio-fs driver in high throughput scenarios. We think
> > > the main bottleneck is the fact that the virtio-fs driver does not support
> > > multi-queue (while the spec does). A big factor in this is that our setup on
> > > the virtio-fs device-side (a DPU) does not easily allow multiple cores to
> > > tend to a single virtio queue.
> 
> This is an interesting limitation in DPU.

Virtqueues are single-consumer queues anyway. Sharing them between
multiple threads would be expensive. I think using multiqueue is natural
and not specific to DPUs.

Stefan

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  reply	other threads:[~2023-02-07 21:32 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <2fd99bc2-0414-0b85-2bff-3a84ae6c23bd@gootzen.net>
2023-02-07 19:45 ` virtio-fs: adding support for multi-queue Stefan Hajnoczi
2023-02-07 19:53   ` Vivek Goyal
2023-02-07 21:32     ` Stefan Hajnoczi [this message]
2023-02-07 21:57       ` Vivek Goyal
2023-02-08  8:33         ` Peter-Jan Gootzen via Virtualization
2023-02-08 10:43           ` Stefan Hajnoczi
2023-02-08 16:29             ` Peter-Jan Gootzen via Virtualization
2023-02-08 20:23               ` Vivek Goyal
2023-02-22 14:32               ` Stefan Hajnoczi
2023-03-07 19:43                 ` Peter-Jan Gootzen via Virtualization
2023-03-07 22:26                   ` Vivek Goyal

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