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 20:49:05 +1100 Message-ID: <51249C11.3050800@crc.id.au> References: <51243089.8020307@crc.id.au> <512488AC.1020702@citrix.com> <51248E23.7060408@crc.id.au> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6385227960301240997==" Return-path: In-Reply-To: <51248E23.7060408@crc.id.au> 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. --===============6385227960301240997== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms030608020007040901010909" This is a cryptographically signed message in MIME format. --------------ms030608020007040901010909 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 20/02/2013 7:49 PM, Steven Haigh wrote: > 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 = to >>> 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 > packages of Xen 4.1.3 back on the system. Rebooting into the new > hypervisor, then starting the single DomU again. Ran bonnie++ again on > the DomU: > > Still around 50Mb/sec - so this doesn't seem to be a regression, but > something else? I've actually done a bit of thinking about this... A recent thread on=20 linux-raid kernel mailing list about Xen and DomU throughput made me=20 revisit my setup. I know I used to be able to saturate GigE both ways=20 (send and receive) to the samba share served by this DomU. This would=20 mean I'd get at least 90-100Mbyte/sec. What exact config and kernel/xen=20 versions this was as this point in time I cannot say. As such, I had a bit of a play and recreated my RAID6 with 64Kb chunk=20 size. This seemed to make rebuild/resync speeds way worse - so I=20 reverted to 128Kb chunk size. The benchmarks I am getting from the Dom0 is about what I'd expect - but = I wouldn't expect to lose 130Mb/sec write speed to the phy:/ pass=20 through of the LV. From my known config where I could saturate the GigE connection, I have = changed from kernel 2.6.32 (Jeremy's git repo) to the latest vanilla=20 kernels - currently 3.7.9. My build of Xen 4.2.1 also has all of the recent security advisories=20 patched as well. Although it is interesting to note that downgrading to=20 Xen 4.1.2 made no difference to write speeds. --=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 --------------ms030608020007040901010909 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 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