From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: 4.2.1: Poor write performance for DomU. Date: Fri, 08 Mar 2013 19:54:31 +1100 Message-ID: <5139A747.80703@crc.id.au> References: <51243089.8020307@crc.id.au> <512488AC.1020702@citrix.com> <51248E23.7060408@crc.id.au> <51249C11.3050800@crc.id.au> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8362357358442030234==" Return-path: In-Reply-To: <51249C11.3050800@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. --===============8362357358442030234== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms030703090506090700040500" This is a cryptographically signed message in MIME format. --------------ms030703090506090700040500 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 20/02/2013 8:49 PM, Steven Haigh wrote: > 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 thes= e >>>> 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. Th= e >>>> 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 > linux-raid kernel mailing list about Xen and DomU throughput made me > revisit my setup. I know I used to be able to saturate GigE both ways > (send and receive) to the samba share served by this DomU. This would > mean I'd get at least 90-100Mbyte/sec. What exact config and kernel/xen= > 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 > size. This seemed to make rebuild/resync speeds way worse - so I > reverted to 128Kb chunk size. > > The benchmarks I am getting from the Dom0 is about what I'd expect - bu= t > I wouldn't expect to lose 130Mb/sec write speed to the phy:/ pass > through of the LV. > > From my known config where I could saturate the GigE connection, I hav= e > changed from kernel 2.6.32 (Jeremy's git repo) to the latest vanilla > kernels - currently 3.7.9. > > 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. > Just wondering if there is any further news or tests that I might be=20 able to do on this? --=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 --------------ms030703090506090700040500 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 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