From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: 4.2.1: Poor write performance for DomU. Date: Wed, 20 Feb 2013 22:08:58 +1100 Message-ID: <5124AECA.4060503@crc.id.au> References: <51243089.8020307@crc.id.au> <512488AC.1020702@citrix.com> <51248E23.7060408@crc.id.au> <51249C11.3050800@crc.id.au> <5124AF9F02000078000BFA35@nat28.tlf.novell.com> <5124AE19.2000802@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============3422737923696360922==" Return-path: In-Reply-To: <5124AE19.2000802@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Andrew Cooper Cc: Roger Pau Monne , Jan Beulich , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org This is a cryptographically signed message in MIME format. --===============3422737923696360922== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms030606080507020301020208" This is a cryptographically signed message in MIME format. --------------ms030606080507020301020208 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 20/02/2013 10:06 PM, Andrew Cooper wrote: > On 20/02/13 10:12, Jan Beulich wrote: >>>>> On 20.02.13 at 10:49, Steven Haigh wrote: >>> My build of Xen 4.2.1 also has all of the recent security advisories >>> patched as well. Although it is interesting to note that downgrading = to >>> Xen 4.1.2 made no difference to write speeds. >> Not surprising at all, considering that the hypervisor is only a passi= ve >> library for all PV I/O purposes. You're likely hunting for a kernel si= de >> regression (and hence the mentioning of the hypervisor version as >> the main factor in the subject is probably misleading). >> >> Jan > > Further to this, do try to verify if your disk driver has changed > recently to use >0 order page allocations for DMA. If it has, then > speed will be much slower as there will now be the swiotlb cpu-copy > overhead. Any hints on how to do this? ;) The kernel modules in use for my SATA drives are ahci and sata_mv. There = are 6 drives in total on the system. sda + sdb =3D RAID1 sd[c-f] =3D RAID6 sda, sdb, sdc and sdd are on the onboard SATA controller (ahci) sde, sdf are on the sata_mv 4x PCIe controller. --=20 Steven Haigh Email: netwiz@crc.id.au Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 Fax: (03) 8338 0299 --------------ms030606080507020301020208 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 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