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From: Bastian Bittorf <bittorf@bluebottle.com>
To: Larry Finger <Larry.Finger@lwfinger.net>,
	openwrt-devel@lists.openwrt.org
Cc: "Rafał Miłecki" <zajec5@gmail.com>,
	linville@tuxdriver.com, linux-wireless@vger.kernel.org,
	netdev@vger.kernel.org, Stable <stable@vger.kernel.org>
Subject: Re: [PATCH] b43: Increase number of RX DMA slots
Date: Tue, 19 Feb 2013 21:01:31 +0100	[thread overview]
Message-ID: <20130219200131.GL8730@medion.lan> (raw)
In-Reply-To: <51228ACF.3060500@lwfinger.net>

* Larry Finger <Larry.Finger@lwfinger.net> [18.02.2013 21:17]:

> (14e4:4315) units. I think the firmware and DMA can handle it. After
> all, all the TX rings have 256 slots. There is, however, a question
> of the memory. TX only acquires the buffers when needed, but RX has
> to get them in advance, thus 256 slots there will waste a lot of
> memory.

I did some testing with 256 slots and the
"b43-workaround-rx-fifo-overflow.patch" on a very slow board,
an i'am sure, that 128 slots are not enough. kernel-log is here:

http://intercity-vpn.de/files/openwrt/b43test.dmesg.txt

this was a normal download (100mb @ 1 megabyte/s), but if you
do some udp-magic (netperf) you run soon into trouble.

thanks for your work!

bye, bastian / wireless.subsignal.org / weimarnetz e.V.

WARNING: multiple messages have this Message-ID (diff)
From: Bastian Bittorf <bittorf@bluebottle.com>
To: Larry Finger <Larry.Finger@lwfinger.net>,
	openwrt-devel@lists.openwrt.org
Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	linville@tuxdriver.com, Stable <stable@vger.kernel.org>
Subject: Re: [PATCH] b43: Increase number of RX DMA slots
Date: Tue, 19 Feb 2013 21:01:31 +0100	[thread overview]
Message-ID: <20130219200131.GL8730@medion.lan> (raw)
In-Reply-To: <51228ACF.3060500@lwfinger.net>

* Larry Finger <Larry.Finger@lwfinger.net> [18.02.2013 21:17]:

> (14e4:4315) units. I think the firmware and DMA can handle it. After
> all, all the TX rings have 256 slots. There is, however, a question
> of the memory. TX only acquires the buffers when needed, but RX has
> to get them in advance, thus 256 slots there will waste a lot of
> memory.

I did some testing with 256 slots and the
"b43-workaround-rx-fifo-overflow.patch" on a very slow board,
an i'am sure, that 128 slots are not enough. kernel-log is here:

http://intercity-vpn.de/files/openwrt/b43test.dmesg.txt

this was a normal download (100mb @ 1 megabyte/s), but if you
do some udp-magic (netperf) you run soon into trouble.

thanks for your work!

bye, bastian / wireless.subsignal.org / weimarnetz e.V.

  reply	other threads:[~2013-02-19 20:01 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-18  3:01 [PATCH] b43: Increase number of RX DMA slots Larry Finger
2013-02-18  3:01 ` Larry Finger
2013-02-18 16:18 ` Rafał Miłecki
2013-02-18 16:18   ` Rafał Miłecki
2013-02-18 16:55   ` Bastian Bittorf
2013-02-18 16:55     ` Bastian Bittorf
2013-02-18 17:04     ` Larry Finger
2013-02-18 20:10   ` Larry Finger
2013-02-19 20:01     ` Bastian Bittorf [this message]
2013-02-19 20:01       ` Bastian Bittorf
2013-02-19  5:52 ` David Miller
2013-02-19  5:52   ` David Miller
2013-02-19  9:42   ` David Laight
2013-02-19  9:57     ` Rafał Miłecki
2013-02-19 17:57     ` Larry Finger
2013-02-19 18:15       ` David Miller
2013-02-19 18:28         ` Larry Finger
2013-02-20  0:47           ` Julian Calaby
2013-02-20  2:42             ` Larry Finger
2013-02-20  6:26               ` Gábor Stefanik
2013-02-20  6:26                 ` Gábor Stefanik
2013-02-20  7:15                 ` Larry Finger
2013-02-20  8:15                   ` Bastian Bittorf
2013-02-20  8:15                     ` Bastian Bittorf
2013-02-20 15:49                     ` Larry Finger

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