Re: MSI-X vector limits and reserving a virtio device ID

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Message-ID: <[email protected]>
Date: Thu, 28 May 2026 03:03:00 -0400
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Subject: Re: MSI-X vector limits and reserving a virtio device ID
To: Parav Pandit <[email protected]>,
 "[email protected]" <[email protected]>
References: <[email protected]>
 <SJ0PR12MB6806C5A16CB0899E095E835EDC092@SJ0PR12MB6806.namprd12.prod.outlook.com>
Content-Language: en-US
From: Demi Marie Obenour <[email protected]>
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In-Reply-To: <SJ0PR12MB6806C5A16CB0899E095E835EDC092@SJ0PR12MB6806.namprd12.prod.outlook.com>

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On 5/28/26 01:22, Parav Pandit wrote:
>=20
>> From: Demi Marie Obenour <[email protected]>
>> Sent: 28 May 2026 05:23 AM
>> To: [email protected]
>> Subject: MSI-X vector limits and reserving a virtio device ID
>>
>> I'd like to reserve a virtio device ID for virtio vhost-guest,
>> formally virtio vhost-user.  Would this be possible?
>>
> Vhost user is an implementation of the device.
> I believe it stays as implementation and not a new device type.

Virtio vhost-user is a device used to implement a vhost-user device
from another VM.

>> Also, I'd like to know which systems have a small limit on the number
>> of MSI-X vectors. =20
> I didn=E2=80=99t follow the question. Typically, Intel cpu has a limit =
of 256 vectors per core.
>=20
>> The vhost-guest device uses lots of MSI-X vectors.
>> Typical implementations will use 256 * 3 + 7 =3D 775 of them!  That ca=
n,
>> of course, be reduced by sharing vectors, but this is undesirable
>> as it comes at a performance cost.
> Did you get a chance to measure the performance, for which device type?=

> Interrupts are generally moderated.
> In other devices (scalable functions of mlx5) I have measured perf of 8=
 to 16 queues sharing a vectors has < 4% perf drop.

I'm more concerned with whether it is a problem to assume that
775 MSI-X interrupts can be exposed by a virtual device.
--=20
Sincerely,
Demi Marie Obenour (she/her/hers)
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Content-Description: OpenPGP digital signature
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