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From: Willy Tarreau <w@1wt.eu>
To: netdev@vger.kernel.org
Cc: eric.dumazet@gmail.com
Subject: GRO + splice panics in 3.7.0-rc5
Date: Thu, 15 Nov 2012 23:28:12 +0100	[thread overview]
Message-ID: <20121115222812.GA647@1wt.eu> (raw)

Hello,

I was just about to make a quick comparison between LRO and GRO in
3.7.0-rc5 to see if LRO still had the big advantage I've always observed,
but I failed the test because as soon as I enable LRO + splice, the kernel
panics and reboots.

I could not yet manage to catch the panic output, I could just reliably
reproduce it, it crashes instantly.

All I can say at the moment is the following :
  - test consist in forwarding HTTP traffic between two NICs via haproxy
  - driver used was myri10ge
  - LRO + recv+send : OK
  - LRO + splice : OK
  - GRO + recv+send : OK
  - GRO + splice : panic
  - no such problem was observed in 3.6.6 so I think this is a recent
    regression.

I'll go back digging for more information, but as I'm used to often see
Eric suggest the right candidates for reverting, I wanted to report the
issue here in case there are easy ones to try first.

Thanks,
Willy

             reply	other threads:[~2012-11-15 22:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-15 22:28 Willy Tarreau [this message]
2012-11-15 23:49 ` GRO + splice panics in 3.7.0-rc5 Eric Dumazet
2012-11-16  6:39   ` Willy Tarreau
2012-12-01 19:43   ` Willy Tarreau
2012-12-01 20:52     ` Willy Tarreau
2012-12-01 21:47       ` Eric Dumazet
2012-12-01 22:32         ` Eric Dumazet
2012-12-01 22:40           ` Willy Tarreau
2012-12-01 23:07             ` [PATCH net] tcp: fix crashes in do_tcp_sendpages() Eric Dumazet
2012-12-02  1:41               ` David Miller
2012-12-02  1:43               ` Joe Perches
2012-12-02  2:58             ` GRO + splice panics in 3.7.0-rc5 Eric Dumazet

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