netdev - Re: [PATCH 0/7] net/9p: remove msize limit in virtio transport

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Message-ID: <20210916190908.19824be5@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 16 Sep 2021 19:09:08 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Christian Schoenebeck <linux_oss@...debyte.com>
Cc:     v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Greg Kurz <groug@...d.org>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 0/7] net/9p: remove msize limit in virtio transport

On Thu, 16 Sep 2021 20:26:08 +0200 Christian Schoenebeck wrote:
> This is an initial draft for getting rid of the current 500k 'msize'
> limitation in the 9p virtio transport, which is currently a bottleneck for
> performance of Linux 9p mounts.
> 
> This is a follow-up of the following series and discussion:
> https://lore.kernel.org/all/28bb651ae0349a7d57e8ddc92c1bd5e62924a912.1630770829.git.linux_oss@crudebyte.com/T/#eb647d0c013616cee3eb8ba9d87da7d8b1f476f37
> 
> Known limitation: With this series applied I can run
> 
>   QEMU host <-> 9P virtio <-> Linux guest
> 
> with up to 3 MB msize. If I try to run it with 4 MB it seems to hit some
> limitation on QEMU side:
> 
>   qemu-system-x86_64: virtio: too many write descriptors in indirect table
> 
> I haven't looked into this issue yet.
> 
> Testing and feedback appreciated!

nit - please run ./scripts/kernel-doc -none on files you're changing.
There seems to be a handful of warnings like this added by the series:

net/9p/trans_virtio.c:155: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst