lkml.org 
[lkml]   [2017]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] ALSA: vsnd: Add Xen para-virtualized frontend driver
From
Date

On 11/02/2017 11:44 AM, Takashi Sakamoto wrote:
> On Oct 30 2017 15:33, Oleksandr Andrushchenko wrote:
>> This is an attempt to summarize previous discussions on Xen para-virtual
>> sound driver.
>>
>> A first attempt has been made to upstream the driver [1] which
>> brought number
>> of fundamental questions, one of the biggest ones was that the
>> frontend driver
>> has no means to synchronize its period elapsed event with the host
>> driver,
>> but uses software emulation on the guest side [2] with a timer.
>> In order to address this a change to the existing Xen para-virtual sound
>> protocol [3] was proposed to fill this gap [4] and remove emulation:
>> 1. Introduced a new event channel from back to front
>> 2. New event with number of bytes played/captured (XENSND_EVT_CUR_POS,
>> to be used for sending snd_pcm_period_elapsed at frontend
>> (in Linux implementation, sent in bytes, not frames to make the protocol
>> generic and consistent)
>> 3. New request for playback/capture control (XENSND_OP_TRIGGER) with
>> start/pause/stop/resume sub-ops.
>>
>> Along with these changes other comments on the driver were addressed,
>> e.g. split into smaller chunks, moved the driver from misc to xen
>> etc. [5].
>>
>> Hope, this helps to get the full picture of what was discussed and
>> makes it
>> possible to move forward: if the approach seems ok, then I'll start
>> upstreaming the changes to the sndif protocol and then will send the
>> updated
>> version of the driver for the further review.
>
> This message has below line in its header.
>
> > In-Reply-To: <e56a09e9-da66-b748-4e82-4b96a18cef32@gmail.com>
>
> This field is defined in RFC822[1], and recent mail clients use this
> header field to associate the message to a message which the field
> indicates. This results in a series of messages, so-called 'message
> thread'. Iwai-san would like you to start a new message thread for
> your topic. Would you please post this message again without the
> header field?
of course, sorry about that
>
> Generally, receiving no reactions means that readers/reviewers don't
> get enough information for your idea yet. (Of course, there's a
> probability that your work attracts no one...) In this case,
> submitting more resources is better, rather than requesting comments
> to them. For instance, you can point links to backend/frontend
> implementation as para-virtualization drivers which use the new
> feature of interface, if you did work for it. Indicating procedure to
> use a series of your work is better for test, if possible.
>
will do
> [1] https://www.ietf.org/rfc/rfc0822.txt
>
> Regards
>
> Takashi Sakamoto
Thank you,
Oleksandr

\
 
 \ /
  Last update: 2017-11-02 10:56    [W:1.705 / U:0.436 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site