From: Steven Haigh <netwiz@crc.id.au>
To: xen-devel@lists.xen.org
Subject: Re: Is: SKB_MAX_LEN bites again. Was: Re: bug disabling guest interface
Date: Sat, 09 Mar 2013 13:19:40 +1100 [thread overview]
Message-ID: <513A9C3C.10707@crc.id.au> (raw)
In-Reply-To: <000301ce1c49$a3f759d0$ebe60d70$@jacekowski.org>
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On 9/03/2013 9:09 AM, Jacek Milewicz wrote:
>>>> Is there any further information on a possible fix for this?
> Thoughts?
>>>> Ideas? As it seems to be hitting multiple sites, I'd like to get it
>>> fixed asap...
>>>
>>> There are 3 ways I can see this fixed:
>>> - update guests so all have same MAX_SKB_FRAGS (that includes windows
>>> drivers (windows drivers use 19 for MAX_SKB_FRAGS)) -add some sort of
>>> negotiation between host and guest
>>> - change MAX_SKB_FRAGS to 19 to accommodate all guests
>>>
>>> Unfortunately first one requires changes to the guest and most don't
>>> have that luxury. So the only way I see it could be fixed without
>>> breaking compatibility even more is
>>
>> Ugh. The negotiations between host and guest is probably the best
> choice.
>> The issues you are going to hit are that you might need to redo the skbs
> to
>> match what the frontend's max is.
>>
>> Annie, Wei, Ian - were there some RFC patches floating around for this?
>>
>
> As much as I agree that negotiation is the best option in long term. It
> relies on people upgrading their kernels - and this is not the case (only
> people running kernels from before 2011-12-23 are affected by this bug
> (I'm not sure about other platforms)).
> And in a lot of cases (VPS providers) there is no easy way to upgrade
> guest kernels.
For what its worth, I've increased the value of MAX_SKB_FRAGS to 19 on
my Dom0 kernel and pushed out new packages... I'll see if I get any
further reports...
--
Steven Haigh
Email: netwiz@crc.id.au
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299
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next prev parent reply other threads:[~2013-03-09 2:19 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 8:46 bug disabling guest interface Steven Haigh
2013-03-08 19:36 ` Jacek Milewicz
2013-03-08 20:36 ` Is: SKB_MAX_LEN bites again. Was: " Konrad Rzeszutek Wilk
2013-03-08 22:09 ` Jacek Milewicz
2013-03-09 2:19 ` Steven Haigh [this message]
2013-03-12 14:49 ` Konrad Rzeszutek Wilk
2013-03-12 14:56 ` Ian Campbell
2013-03-12 15:05 ` Steven Haigh
2013-03-12 15:08 ` Ian Campbell
2013-03-12 22:19 ` James Harper
2013-03-13 4:09 ` jacek burghardt
2013-03-12 14:49 ` Konrad Rzeszutek Wilk
2013-03-09 2:57 ` Ian Campbell
2013-03-09 3:16 ` Steven Haigh
2013-03-09 12:53 ` Sander Eikelenboom
2013-03-10 4:58 ` ANNIE LI
2013-03-10 4:49 ` ANNIE LI
2013-03-12 11:39 ` Ian Campbell
2013-03-10 19:18 ` Wei Liu
2013-03-12 11:40 ` Ian Campbell
2013-03-12 12:18 ` Wei Liu
2013-03-12 15:07 ` ANNIE LI
2013-03-12 15:25 ` Wei Liu
2013-03-12 20:13 ` Wei Liu
2013-03-12 21:08 ` Wei Liu
2013-03-13 6:44 ` annie li
2013-03-13 9:43 ` Ian Campbell
2013-03-13 11:24 ` Wei Liu
2013-03-13 6:22 ` annie li
2013-03-13 11:26 ` Wei Liu
2013-03-10 4:48 ` ANNIE LI
[not found] <CAHyyzzTtK+LbxOh2r_X0=Zd2FsTxoAiLLaWahv5FY-QZnQxhLQ@mail.gmail.com>
[not found] ` <CAHyyzzSO0vY3LquDjXVAeV3U9sLnAY28+iADzsOLFkMGcJHLOQ@mail.gmail.com>
[not found] ` <CAHyyzzSDqmBNWmyRKFijei8YrJD5i40AJ9mcxxnme9CeCLZX2g@mail.gmail.com>
[not found] ` <CAHyyzzQcjzeWv-Z6SBOb8Ra0u6BOMzjKV3Ze482rMmMHkAMccw@mail.gmail.com>
[not found] ` <CAHyyzzQsh30y7-4M1xmJc+8p-EcqS0+jaibpTrXxTQi92iGDgw@mail.gmail.com>
2013-04-10 15:28 ` (no subject) jacek burghardt
[not found] ` <20130411010344.GY11427@reaktio.net>
2013-04-11 7:31 ` Is: SKB_MAX_LEN bites again. Was: Re: bug disabling guest interface Brian Menges
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