From: "Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>
To: Teddy Astie <teddy.astie@vates.tech>
Cc: Val Packett <val@invisiblethingslab.com>,
Demi Marie Obenour <demiobenour@gmail.com>,
Xen developer discussion <xen-devel@lists.xenproject.org>,
dri-devel@lists.freedesktop.org, linux-mm@kvack.org,
Ariadne Conill <ariadne@ariadne.space>
Subject: Re: Why memory lending is needed for GPU acceleration
Date: Fri, 3 Apr 2026 23:24:07 +0200 [thread overview]
Message-ID: <adAv-HfiyKptEVvq@mail-itl> (raw)
In-Reply-To: <1de15ce0-9f7e-4253-80a7-ecd94caa4325@vates.tech>
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On Tue, Mar 31, 2026 at 09:42:22AM +0000, Teddy Astie wrote:
> XEN_GNTDEV_DMABUF has been designed for GPU use-cases, and more
> precisely for paravirtualizing a display. The only issue I would have
> with it is that grants are not scalable for GPU 3D use cases (with
> hundreds of MB to share).
FWIW we do use grants for graphics buffers already - window composition
buffers specifically. We do run xen with extra options for that:
gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096
And similarly, on domU side:
echo 1073741824 > /sys/module/xen_gntalloc/parameters/limit
--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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next prev parent reply other threads:[~2026-04-03 21:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 14:17 Mapping non-pinned memory from one Xen domain into another Demi Marie Obenour
2026-03-24 18:00 ` Teddy Astie
2026-03-26 17:18 ` Demi Marie Obenour
2026-03-26 18:26 ` Teddy Astie
2026-03-27 17:18 ` Demi Marie Obenour
2026-03-29 17:32 ` Why memory lending is needed for GPU acceleration Demi Marie Obenour
2026-03-30 10:15 ` Teddy Astie
2026-03-30 10:25 ` Jan Beulich
2026-03-30 12:24 ` Demi Marie Obenour
2026-03-30 20:07 ` Val Packett
2026-03-31 9:42 ` Teddy Astie
2026-03-31 11:23 ` Val Packett
2026-04-03 21:24 ` Marek Marczykowski-Górecki [this message]
2026-03-30 12:13 ` Mapping non-pinned memory from one Xen domain into another Teddy Astie
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