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 19:49:39 +1100 Message-ID: <51248E23.7060408@crc.id.au> References: <51243089.8020307@crc.id.au> <512488AC.1020702@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1720385402080561010==" Return-path: In-Reply-To: <512488AC.1020702@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: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org This is a cryptographically signed message in MIME format. --===============1720385402080561010== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms000701050702070300030605" This is a cryptographically signed message in MIME format. --------------ms000701050702070300030605 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 20/02/2013 7:26 PM, Roger Pau Monn=E9 wrote: > On 20/02/13 03:10, Steven Haigh wrote: >> Hi guys, >> >> Firstly, please CC me in to any replies as I'm not a subscriber these = days. >> >> I've been trying to debug a problem with Xen 4.2.1 where I am unable t= o >> achieve more than ~50Mb/sec sustained sequential write to a disk. The >> DomU is configured as such: > > Since you mention 4.2.1 explicitly, is this a performance regression > from previous versions? (4.2.0 or the 4.1 branch) This is actually a very good question. I've reinstalled my older=20 packages of Xen 4.1.3 back on the system. Rebooting into the new=20 hypervisor, then starting the single DomU again. Ran bonnie++ again on=20 the DomU: Version 1.96 ------Sequential Output------ --Sequential Input-=20 --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--=20 --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP=20 /sec %CP zeus.crc.id.au 2G 658 97 54893 9 40845 10 1056 97 280453 33=20 561.2 13 Latency 27145us 426ms 257ms 31900us 24701us=20 222ms Version 1.96 ------Sequential Create------ --------Random=20 Create-------- zeus.crc.id.au -Create-- --Read--- -Delete-- -Create-- --Read---=20 -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP=20 /sec %CP 16 19281 52 +++++ +++ +++++ +++ 24435 66 +++++ +++=20 +++++ +++ Latency 22860us 182us 706us 14803us 28us=20 300us Still around 50Mb/sec - so this doesn't seem to be a regression, but=20 something else? >> ~50Mb/sec write, ~267Mb/sec read. Not so awesome. > > We are currently working on improving the speed of pv block drivers, I > will look into this difference between the read/write speed, but I woul= d > guess this is due to the size of the request/ring. I would assume this would be in the DomU kernel? --=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 --------------ms000701050702070300030605 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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