From: "Michael S. Tsirkin" <mst@redhat.com>
To: Demi Marie Obenour <demiobenour@gmail.com>
Cc: "virtio-comment@lists.linux.dev" <virtio-comment@lists.linux.dev>
Subject: Re: MSI-X vector limits and reserving a virtio device ID
Date: Thu, 28 May 2026 01:22:15 -0400 [thread overview]
Message-ID: <20260528010721-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <11771164-7919-43e1-a980-03f036bdae2e@gmail.com>
On Wed, May 27, 2026 at 07:53:11PM -0400, Demi Marie Obenour wrote:
> I'd like to reserve a virtio device ID for virtio vhost-guest,
> formally virtio vhost-user. Would this be possible?
yes, follow the regular process for reserving IDs.
> Also, I'd like to know which systems have a small limit on the number
> of MSI-X vectors. The vhost-guest device uses lots of MSI-X vectors.
> Typical implementations will use 256 * 3 + 7 = 775 of them! That can,
> of course, be reduced by sharing vectors, but this is undesirable
> as it comes at a performance cost.
A single cpu x86 system?
> --
> Sincerely,
> Demi Marie Obenour (she/her/hers)
next prev parent reply other threads:[~2026-05-28 5:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-27 23:53 MSI-X vector limits and reserving a virtio device ID Demi Marie Obenour
2026-05-28 5:22 ` Michael S. Tsirkin [this message]
2026-05-28 7:05 ` Demi Marie Obenour
2026-05-28 7:13 ` Michael S. Tsirkin
2026-05-28 5:22 ` Parav Pandit
2026-05-28 5:47 ` Manos Pitsidianakis
2026-05-28 6:59 ` Vhost-guest (was virtio vhost-user) vs virtio-msg Demi Marie Obenour
2026-05-28 8:56 ` Alyssa Ross
2026-05-28 13:52 ` Stefan Hajnoczi
2026-05-28 16:13 ` Alex Bennée
2026-05-28 13:36 ` MSI-X vector limits and reserving a virtio device ID Stefan Hajnoczi
2026-05-28 7:03 ` Demi Marie Obenour
2026-05-28 7:23 ` Michael S. Tsirkin
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