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Re: [Xen-devel] kernel panic in skb_copy_bits

To: eric.dumazet@xxxxxxxxx
From: David Miller <davem@xxxxxxxxxxxxx>
Date: Thu, 04 Jul 2013 14:32:46 -0700 (PDT)
Cc: frank.blaschka@xxxxxxxxxx, zheng.x.li@xxxxxxxxxx, Ian.Campbell@xxxxxxxxxx, stefano.stabellini@xxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, joe.jin@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, JBeulich@xxxxxxxx, alex@xxxxxxxxxxx
Delivery-date: Thu, 04 Jul 2013 21:33:24 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Thu, 04 Jul 2013 03:12:10 -0700

> It looks like a typical COW issue to me.

Generically speaking, if we have to mess with page protections this
eliminates the performance gain from bypass/zerocopy/whatever that
these virtualization layers are doing.

But there may be other factors involved which might mitigate that.

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References:
- Re: [Xen-devel] kernel panic in skb_copy_bits
  - From: Eric Dumazet
- Re: [Xen-devel] kernel panic in skb_copy_bits
  - From: Ian Campbell
- Re: [Xen-devel] kernel panic in skb_copy_bits
  - From: Eric Dumazet

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