From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: Is: SKB_MAX_LEN bites again. Was: Re: bug disabling guest interface Date: Sat, 09 Mar 2013 13:19:40 +1100 Message-ID: <513A9C3C.10707@crc.id.au> References: <5139A56D.30107@crc.id.au> <00bf01ce1c34$395a4f20$ac0eed60$@jacekowski.org> <20130308203636.GA5422@phenom.dumpdata.com> <000301ce1c49$a3f759d0$ebe60d70$@jacekowski.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6731938181081158249==" Return-path: In-Reply-To: <000301ce1c49$a3f759d0$ebe60d70$@jacekowski.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org This is a cryptographically signed message in MIME format. --===============6731938181081158249== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms030109060300090104070308" This is a cryptographically signed message in MIME format. --------------ms030109060300090104070308 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable 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 sk= bs > 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 (on= ly > 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=20 my Dom0 kernel and pushed out new packages... I'll see if I get any=20 further reports... --=20 Steven Haigh Email: netwiz@crc.id.au Web: https://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 Fax: (03) 8338 0299 --------------ms030109060300090104070308 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIMdTCC BjQwggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoT DVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNp Z25pbmcxKTAnBgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3 MTAyNDIxMDE1NVoXDTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1T dGFydENvbSBMdGQuMSswKQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWdu aW5nMTgwNgYDVQQDEy9TdGFydENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENs aWVudCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOr 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