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From: "John W. Linville" <linville@tuxdriver.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Nathaniel Smith <njs@pobox.com>,
	linux-wireless@vger.kernel.org, wey-yi.w.guy@intel.com,
	ilw@linux.intel.com
Subject: Re: [PATCH 4/5] iwlwifi: auto-tune tx queue size to minimize latency
Date: Tue, 15 Feb 2011 10:03:18 -0500	[thread overview]
Message-ID: <20110215150317.GA2557@tuxdriver.com> (raw)
In-Reply-To: <1297771986.3935.9.camel@jlt3.sipsolutions.net>

On Tue, Feb 15, 2011 at 01:13:06PM +0100, Johannes Berg wrote:

> mac80211 has the advantage that TX status is reported back, so it could
> pretty accurately know how many frames are queued up -- more generically
> this cannot be done.
> 
> But since it's not perfectly accurate right now, it may not be the best
> idea to do this at this time.

Let's not make the perfect the enemy of the good.  An imperfect
implementation at the mac80211 layer is likely better than a somewhat
better implementation for one driver and no implementation for
the rest.

Now, someone help me understand how .11n aggregation complicates this... :-)

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.

  reply	other threads:[~2011-02-15 15:15 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-13 17:56 [PATCH 0/5] iwlwifi: Auto-tune tx queue size to maintain latency under load Nathaniel J. Smith
2011-02-13 17:56 ` [PATCH 1/5] iwlwifi: Simplify tx queue management Nathaniel J. Smith
2011-02-14  9:57   ` Johannes Berg
2011-02-14 22:17     ` Nathaniel Smith
2011-02-14 22:45       ` wwguy
2011-02-15  0:15         ` Dave Täht
2011-02-16  9:16         ` Stanislaw Gruszka
2011-02-16 14:41           ` John W. Linville
2011-02-16 15:13             ` wwguy
2011-02-15 12:11       ` Johannes Berg
2011-02-14 15:33   ` wwguy
2011-02-13 17:56 ` [PATCH 2/5] iwlwifi: Convert the tx queue high_mark to an atomic_t Nathaniel J. Smith
2011-02-14 12:16   ` Johannes Berg
2011-02-14 22:35     ` Nathaniel Smith
2011-02-15 12:08       ` Johannes Berg
2011-02-15 17:37         ` Nathaniel Smith
2011-02-13 17:56 ` [PATCH 3/5] iwlwifi: Invert the sense of the queue high_mark Nathaniel J. Smith
2011-02-13 17:56 ` [PATCH 4/5] iwlwifi: auto-tune tx queue size to minimize latency Nathaniel J. Smith
2011-02-14 12:17   ` Johannes Berg
2011-02-14 21:58     ` Nathaniel Smith
2011-02-15 12:13       ` Johannes Berg
2011-02-15 15:03         ` John W. Linville [this message]
2011-02-16  8:59           ` Johannes Berg
2011-02-15 17:31         ` Nathaniel Smith
2011-02-14 15:46   ` wwguy
2011-02-13 17:56 ` [PATCH 5/5] iwlwifi: make current tx queue sizes visible in debugfs Nathaniel J. Smith
2011-02-14  0:32 ` [PATCH 0/5] iwlwifi: Auto-tune tx queue size to maintain latency under load Julian Calaby
2011-02-14  3:28   ` Nathaniel Smith
2011-02-16 15:50 ` John W. Linville
2011-02-16 23:08   ` Nathaniel Smith
2011-02-16 23:42     ` wwguy
2011-02-17  1:49 ` [RFC] mac80211: implement eBDP algorithm to fight bufferbloat John W. Linville
2011-02-17  3:31   ` Ben Greear
2011-02-17  4:26   ` Nathaniel Smith
2011-02-17  8:31   ` Johannes Berg
2011-02-18 21:21   ` [RFC v2] " John W. Linville
2011-02-19  3:44     ` Nathaniel Smith
2011-02-21 18:47       ` John W. Linville
2011-02-21 23:26         ` Nathaniel Smith
2011-02-23 22:28           ` John W. Linville
2011-02-25 18:21             ` Nathaniel Smith
2011-02-25 18:27               ` Nathaniel Smith
2011-02-20  0:37     ` Nathaniel Smith
2011-02-21 18:52       ` John W. Linville
2011-02-21 15:28     ` Johannes Berg
2011-02-21 19:06       ` John W. Linville
2011-02-21 20:26         ` Tianji Li
2011-02-28 13:07         ` Johannes Berg

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