From: Sascha Hauer <s.hauer@pengutronix.de>
To: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] net: smc1111: fix memory congestions
Date: Mon, 5 Jan 2015 13:11:50 +0100 [thread overview]
Message-ID: <20150105121150.GC4544@pengutronix.de> (raw)
In-Reply-To: <1420142663-6243-2-git-send-email-robert.jarzmik@free.fr>
On Thu, Jan 01, 2015 at 09:04:22PM +0100, Robert Jarzmik wrote:
> As the SMC1111 has a shared pool of 2k memory buckets for both
> transmission and reception, and as there are variants which have as few
> as 4 buckets in total, the memory pool can be hogged by unclaimed
> receptions, and impeed any further transmission.
>
> This happens on the zylonite pxa board, where 4 packets, most probably
> icmp and arp, fill the 4 buckets, preventing any further ethernet
> transmission, and stalling the driver.
>
> The fix is rather rough : whenever all the buckets are filled by
> reception packets, and if a transmission is required, the transmission
> code path will empty up all received packets.
I don't know the hardware (not anymore, fortunately ;), but isn't it
possible to dedicate one bucket for transmitting only, so that it will
never be occupied by a received packet?
Sascha
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next prev parent reply other threads:[~2015-01-05 12:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-01 20:04 [PATCH] commands: loady: fix bug with netconsole Robert Jarzmik
2015-01-01 20:04 ` [PATCH] net: smc1111: fix memory congestions Robert Jarzmik
2015-01-05 12:11 ` Sascha Hauer [this message]
2015-01-05 16:16 ` robert.jarzmik
2015-01-06 13:58 ` Sascha Hauer
2015-01-01 20:04 ` [PATCH] net: smc1111: move print_packet function Robert Jarzmik
2015-01-05 12:12 ` Sascha Hauer
2015-01-05 12:12 ` [PATCH] commands: loady: fix bug with netconsole Sascha Hauer
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