On 28/10/2024 18:23, Jason Gunthorpe wrote:
On Mon, Oct 28, 2024 at 10:13:48AM -0600, Alex Williamson wrote:
On Sun, 27 Oct 2024 12:07:44 +0200
Yishai Hadas <yishaih@xxxxxxxxxx> wrote:
If the virtio spec doesn't support partial contexts, what makes it
beneficial here?
It stil lets the receiver 'warm up', like allocating memory and
approximately sizing things.
If it is beneficial, why is it beneficial to send initial data more than
once?
I guess because it is allowed to change and the benefit is highest
when the pre copy data closely matches the final data..
Rate limiting does seem better to me
Jason
Right, given that the device state is likely to remain mostly unchanged
over a certain period, using a rate limiter could be a sensible approach.
So, in V1, I plan to replace the hard-coded limit value of 128 with a
rate limiter by reporting no data available for some time interval after
the previous call.
I would start with a one second interval, which seems to be reasonable
for that kind of device.
Yishai
