Re: [Xen-devel] [PATCH v5] sndif: add ABI for Para-virtual sound

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

On Thu, Jan 22, 2015 at 5:56 PM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Oleksandr Dmytryshyn writes ("Re: [Xen-devel] [PATCH v5] sndif: add ABI for 
> Para-virtual sound"):
>> On Thu, Jan 22, 2015 at 5:39 PM, Roger Pau Monnà <roger.pau@xxxxxxxxxx> 
>> wrote:
>> > Also, how often are the sound packets sent, and which size do they have?
>> > I'm mainly asking because I don't know if it would be more suitable to
>> > use the same strategy as we did with indirect descriptors in the block
>> > protocol from the start.
> ...
>> In my case this is about 3 packets per second with size about 16 KBytes.
>
> That would put a floor on the latency of about 300ms.  I suspect
> that's quite undesirable.
This latency doesn't affect us because frontend and backend driver have
an separate thread for each virtualized stream. And when frontend driver
waits answer from the backend it just sleeps (in case Linux kernel it waits
for the completion).

> Ian.

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