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Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
Date 2015-09-16 20:00 +0200
Message-ID <q9p9U-3ca-29@gated-at.bofh.it> (permalink)
References <q9nhO-vs-37@gated-at.bofh.it> <q9nrt-W0-35@gated-at.bofh.it> <q9nKQ-1iB-63@gated-at.bofh.it>
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From: David Laight <David.Laight@ACULAB.COM>
Date: Wed, 16 Sep 2015 16:25:03 +0000

> Am I right in thinking this is adding an extra 96 unused bytes to the front
> of almost all skb just so that hyper-v can make its link level header
> contiguous with whatever follows (IP header ?).
> 
> Doesn't sound ideal.

Agreed, this is rediculous, and the entire stack will incur this cost
just because hyperv is enabled in the kernel config.
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Thread

[PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-09-16 18:00 +0200
  RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Haiyang Zhang <haiyangz@microsoft.com> - 2015-09-16 18:10 +0200
    RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V David Laight <David.Laight@ACULAB.COM> - 2015-09-16 18:30 +0200
      Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Alexander Duyck <alexander.duyck@gmail.com> - 2015-09-16 19:30 +0200
      Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V David Miller <davem@davemloft.net> - 2015-09-16 20:00 +0200
        Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-09-17 11:10 +0200
      RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-16 20:00 +0200
        Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Alexander Duyck <alexander.duyck@gmail.com> - 2015-09-16 23:40 +0200
          RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-17 01:40 +0200
            Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V Alexander Duyck <alexander.duyck@gmail.com> - 2015-09-17 01:50 +0200
              RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-17 02:00 +0200
            RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V David Laight <David.Laight@ACULAB.COM> - 2015-09-17 10:40 +0200
              RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-17 17:20 +0200
                Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V David Miller <davem@davemloft.net> - 2015-09-17 21:00 +0200
                RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-17 22:00 +0200
                Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V David Miller <davem@davemloft.net> - 2015-09-17 22:20 +0200
                RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V KY Srinivasan <kys@microsoft.com> - 2015-09-17 23:20 +0200

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