From: Clemens Ladisch <clemens@ladisch.de>
To: Felix Homann <linuxaudio@showlabor.de>
Cc: alsa-devel@alsa-project.org
Subject: Re: Fast Track Ultra latency and new streaming logic.
Date: Thu, 03 May 2012 17:21:52 +0200 [thread overview]
Message-ID: <4FA2A290.6010301@ladisch.de> (raw)
In-Reply-To: <CAFz=ag7fvr5+Pz0jePNZ+7xhXZ7n1Td4v3=ZZFQcb6Sqy+RQXw@mail.gmail.com>
Felix Homann wrote:
> 2012/5/3 Clemens Ladisch <clemens@ladisch.de>:
>> USB playback also adds further latency by queueing the packets; the
>> number of packets can be seen under "URBs" in /proc/asound/card?/stream0.
>> (There are 1000/8000 packets per second at full/high speed.)
>
> I'm getting "URBs = 2 [ 5 6 ]" for playback and "URBs = 8 [ 8 8 8 8
> 8 8 8 8 ]" for capture with the "old" streaming logic. What does it
> mean?
The queue length is 5+6 = 11 packets; at high speed, that's
11 / 8 kHz = 1.4 ms.
Regards,
Clemens
next prev parent reply other threads:[~2012-05-03 15:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-01 0:18 Fast Track Ultra latency and new streaming logic Grant Diffey
2012-05-01 13:09 ` Felix Homann
2012-05-02 8:41 ` Daniel Mack
2012-05-03 8:39 ` Felix Homann
2012-05-03 14:03 ` Felix Homann
[not found] ` <CAFz=ag4j2OZTZqzeo+h210AaVgToA93hTs5QPL1UPHCCCLJkZg@mail.gmail.com>
2012-05-09 13:12 ` Takashi Iwai
2012-05-09 18:13 ` Felix Homann
2012-05-09 15:07 ` Felix Homann
2012-05-03 14:13 ` Clemens Ladisch
[not found] ` <CAFz=ag7fvr5+Pz0jePNZ+7xhXZ7n1Td4v3=ZZFQcb6Sqy+RQXw@mail.gmail.com>
2012-05-03 15:21 ` Clemens Ladisch [this message]
-- strict thread matches above, loose matches on Subject: below --
2012-05-08 17:07 Aurélien Leblond
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4FA2A290.6010301@ladisch.de \
--to=clemens@ladisch.de \
--cc=alsa-devel@alsa-project.org \
--cc=linuxaudio@showlabor.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.