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Re: [PATCH] memory: arrange to conserve on DMA reservation
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jun 2025 18:02:07 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Mon, 16 Jun 2025 16:02:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.06.2025 17:41, Roger Pau Monné wrote:
> On Mon, Jun 16, 2025 at 05:20:45PM +0200, Jan Beulich wrote:
>> On 16.06.2025 16:46, Roger Pau Monné wrote:
>>> One question I have though, on systems with a low amount of memory
>>> (let's say 8GB), does this lead to an increase in domain construction
>>> time due to having to fallback to order 0 allocations when running out
>>> of non-DMA memory?
>>
>> It'll likely be slower, yes, but I can't guesstimate by how much.
>
> Should there be some way to control this behavior then? I'm mostly
> thinking about client systems like Qubes where memory is likely
> limited, and the extra slowness to create VMs could become
> noticeable?
What kind of control would you be thinking of here? Yet another command
line option?
Jan
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