From: "Rajwa, Marcin" <marcin.rajwa@linux.intel.com>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
"Jie, Yang" <yang.jie@intel.com>, Takashi Iwai <tiwai@suse.de>,
Keyon Jie <yang.jie@linux.intel.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
Subject: Re: [alsa-devel] [PATCH] ALSA: pcm: fix buffer_bytes max constrained by preallocated bytes issue
Date: Thu, 16 Jan 2020 18:25:52 +0100 [thread overview]
Message-ID: <93ac843a-bad5-550e-f427-e2a94bd3e8ef@linux.intel.com> (raw)
In-Reply-To: <c70934a1-b838-5029-6573-bf76a34c4cb9@linux.intel.com>
On 1/16/2020 5:39 PM, Pierre-Louis Bossart wrote:
>
>>> So, do you suggest not doing preallocation(or calling it with 0
>>> size) for all
>>> driver with TYPE_SG? I am fine if this is the recommended method, I
>>> can try
>>> this on SOF I2S platform to see if it can work as we required for
>>> very large
>>> buffer size.
>
> Keyon, for the rest of us to follow this patch, would you mind
> clarifying what drives the need for a 'very large buffer size', and
> what order of magnitude this very large size would be.
>
> FWIW, we've measured consistently on different Windows/Linux
> platforms, maybe 10 years ago, that once you reach a buffer of 1s (384
> kB) the benefits from increasing that buffer size further are marginal
> in terms of power consumption, and generate all kinds of issues with
> volume updates and deferred routing changes.
>
We need bigger buffer on host side to compensate the wake up time from
d0ix to d0 which takes ~2 seconds on my setup. So, wiith smaller buffer
sizes like < 2 seconds we overwrite data since FW keeps copping while
host doesn't read until its up and running again.
> Thanks
> -Pierre
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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next prev parent reply other threads:[~2020-01-16 17:35 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 4:53 [alsa-devel] [PATCH] ALSA: pcm: fix buffer_bytes max constrained by preallocated bytes issue Keyon Jie
2020-01-16 7:15 ` Takashi Iwai
2020-01-16 9:50 ` Keyon Jie
2020-01-16 10:27 ` Takashi Iwai
2020-01-16 11:25 ` Keyon Jie
2020-01-16 11:50 ` Takashi Iwai
2020-01-16 14:14 ` Jie, Yang
2020-01-16 15:31 ` Jie, Yang
2020-01-16 16:07 ` Takashi Iwai
2020-01-16 16:39 ` Pierre-Louis Bossart
2020-01-16 17:25 ` Rajwa, Marcin [this message]
2020-01-16 17:40 ` Pierre-Louis Bossart
2020-01-16 20:37 ` Takashi Iwai
2020-01-17 5:30 ` Keyon Jie
2020-01-17 7:57 ` Takashi Iwai
2020-01-17 10:13 ` Keyon Jie
2020-01-17 10:30 ` Takashi Iwai
2020-01-17 10:56 ` Keyon Jie
2020-01-17 11:15 ` Takashi Iwai
2020-01-17 5:37 ` Keyon Jie
2020-01-17 8:00 ` Takashi Iwai
2020-01-17 10:43 ` Keyon Jie
2020-01-17 11:12 ` Takashi Iwai
2020-01-19 3:52 ` Keyon Jie
2020-01-19 7:09 ` Takashi Iwai
2020-01-19 8:11 ` Keyon Jie
2020-01-19 9:04 ` Takashi Iwai
2020-01-19 10:14 ` Keyon Jie
2020-01-19 10:43 ` Takashi Iwai
2020-01-20 2:23 ` Keyon Jie
2020-01-16 15:45 ` Takashi Iwai
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