netdev - Re: [PATCH] bnx2x: fix panic when TX ring is full

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Message-ID: <1340291526.4604.5710.camel@edumazet-glaptop>
Date:	Thu, 21 Jun 2012 17:12:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dmitry Kravkov <dmitry@...adcom.com>
Cc:	Tomas Hruby <thruby@...gle.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"therbert@...gle.com" <therbert@...gle.com>,
	"evansr@...gle.com" <evansr@...gle.com>,
	Eilon Greenstein <eilong@...adcom.com>,
	Merav Sicron <meravs@...adcom.com>,
	Yaniv Rosner <yaniv.rosner@...adcom.com>,
	"willemb@...gle.com" <willemb@...gle.com>
Subject: Re: [PATCH] bnx2x: fix panic when TX ring is full

On Thu, 2012-06-21 at 15:19 +0300, Dmitry Kravkov wrote:

> The crash happens with default configuration since
> [4acb41903b2f99f3dffd4c3df9acc84ca5942cb2] "net/tcp: Fix tcp memory
> limits initialization when !CONFIG_SYSCTL", but it can be hit by
> increasing values of tcp_wmem even earlier.

This makes no sense.

> From: Dmitry Kravkov <dmitry@...adcom.com>
> Subject: [PATCH net-next] bnx2x: reservation for NEXT tx BDs
> 
> Commit [4acb41903b2f99f3dffd4c3df9acc84ca5942cb2]
> net/tcp: Fix tcp memory limits initialization when !CONFIG_SYSCTL
> provided new default value for tcp_wmem, since heavy tcp
> traffic may cause the TSO packet to consume 20 BDs + 1 for next page
> descriptor.

This is completely bogus. I have no idea how you came to this.

A forwarding workload can trigger same bug, if GRO is enabled.

Remove this wrong bit, please ?


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