Xen project Mailing List

Re: [Xen-API] [XCP 1.6 beta] poor performance while importing vm template

From: SpamMePlease PleasePlease <spankthespam@xxxxxxxxx>

Date: Tue, 2 Oct 2012 18:59:55 +0100

Delivery-date: Tue, 02 Oct 2012 18:00:10 +0000

List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>

Dear George, While I value and appreciate the fact you're getting involved in this issue (and many others) I cant ignore the fact that you are not really helpful with your comments, and here's why: On Tue, Oct 2, 2012 at 5:16 PM, George Shuklin <george.shuklin@xxxxxxxxx> wrote: > Can't confirm that. > > I've create and install new debian (minimal installation), here > > time xe vm-export uuid=c0723402-d1d1-993f-8f6e-d81cbbad8b5c > filename=/mnt/test.vm > Export succeeded > real 0m33.411s > user 0m0.030s > sys 0m0.000s > (/mnt is external storage mounted via NFS, 1G link, during export I've got > about 500Mb/s, which is decent for non-tuned tcp in 2.6.32). First of all, you havent specified the size of the xva, and your minimal debian installation might be much slower than mine xva's, so you're not really confirming (or not) anything here. Its also my bad, since I havent posted in initial message that one of mine xva's was 854M large, and second was 1.5G, with second one taking about twice as much time to import, than the smaller one. Second, you're comparing NFS based storage, while I am complaining about local, single disk LVM based storage, not exactly the same thing, what may heavily affect your results when it comes to confirming my results. > > I think you experience some generic system performance issues, they are not > related to XCP. I dont know how this might not be XCP related, when the system is a fresh, pure XCP that at the point of issue existence and testing does nothing, without any other activites. > > If you wish more help, you need to point to more specific problem, then just > 'export is slow'. First, its not about export, but import of the vm's and incredibly high iowait and load while doing so. Second, the 'export is very slow, and the dom0 iowait skyrockets' is quite specific, and mentioned by few other people, earlier on the list. I really dont know how to be more specific about the issue, and I've provided the information I thought would be useful to describe the issue symptoms I've been experiencing. If anyone requires any other, I am more than happy to provide them asap, and to conduct any tests required. Kind regards, S. > > > 02.10.2012 19:30, SpamMePlease PleasePlease ÐÐÑÐÑ: >> >> Hi all, >> >> I would like to report that there's an issue that exists on XCP 1.6 >> beta (and 1.1 stable too) that results in very slow vm import/export, >> causing high IO wait and load. The details are below, the machine is >> freshly installed, without any modifications (like md raid, and so >> on): >> >> iostat: >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0,00 0,00 0,00 62,98 0,00 37,02 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz >> avgqu-sz await svctm %util >> sda 0,00 0,40 0,00 6,19 0,00 2184,83 353,10 >> 3,76 553,87 161,61 100,00 >> sda1 0,00 0,00 0,00 0,60 0,00 35,13 58,67 >> 0,75 1540,00 893,33 53,49 >> sda2 0,00 0,00 0,00 0,00 0,00 0,00 0,00 >> 0,00 0,00 0,00 0,00 >> sda3 0,00 0,40 0,00 5,59 0,00 2149,70 384,64 >> 3,01 448,21 178,93 100,00 >> sdb 0,00 0,00 0,00 0,00 0,00 0,00 0,00 >> 0,00 0,00 0,00 0,00 >> dm-0 0,00 0,00 0,00 0,00 0,00 0,00 0,00 >> 0,00 0,00 0,00 0,00 >> dm-1 0,00 0,00 0,00 6,39 0,00 2203,79 345,03 >> 3,25 444,38 156,56 100,00 >> tda 0,00 215,57 0,00 25,15 0,00 2181,24 86,73 >> 172,15 7475,32 39,76 100,00 >> >> >> >> top: >> >> top - 17:26:48 up 13 min, 2 users, load average: 2.79, 1.63, 0.77 >> Tasks: 135 total, 1 running, 134 sleeping, 0 stopped, 0 zombie >> Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 25.4%id, 74.6%wa, 0.0%hi, 0.0%si, >> 0.0%st >> Mem: 762244k total, 747080k used, 15164k free, 238616k buffers >> Swap: 524280k total, 0k used, 524280k free, 289188k cached >> >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >> 5901 root 20 0 26424 8544 268 S 0.3 1.1 0:00.45 >> elasticsyslog >> 10758 root 20 0 2428 1104 820 R 0.3 0.1 0:00.02 top >> 1 root 20 0 2164 656 564 S 0.0 0.1 0:00.23 init >> 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd >> 3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 >> migration/0 >> 4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 >> >> >> >> lspci: >> >> 00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM >> Controller (rev 09) >> 00:01.0 PCI bridge: Intel Corporation 3rd Gen Core processor PCI >> Express Root Port (rev 09) >> 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core >> processor Graphics Controller (rev 09) >> 00:14.0 USB controller: Intel Corporation 7 Series Chipset Family USB >> xHCI Host Controller (rev 04) >> 00:16.0 Communication controller: Intel Corporation 7 Series Chipset >> Family MEI Controller #1 (rev 04) >> 00:1a.0 USB controller: Intel Corporation 7 Series Chipset Family USB >> Enhanced Host Controller #2 (rev 04) >> 00:1c.0 PCI bridge: Intel Corporation 7 Series Chipset Family PCI >> Express Root Port 1 (rev c4) >> 00:1c.4 PCI bridge: Intel Corporation 7 Series Chipset Family PCI >> Express Root Port 5 (rev c4) >> 00:1c.6 PCI bridge: Intel Corporation 7 Series Chipset Family PCI >> Express Root Port 7 (rev c4) >> 00:1d.0 USB controller: Intel Corporation 7 Series Chipset Family USB >> Enhanced Host Controller #1 (rev 04) >> 00:1f.0 ISA bridge: Intel Corporation H77 Express Chipset LPC >> Controller (rev 04) >> 00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family >> 6-port SATA AHCI Controller (rev 04) >> 00:1f.3 SMBus: Intel Corporation 7 Series Chipset Family SMBus >> Controller (rev 04) >> 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. >> RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 09) >> 04:00.0 IDE interface: Marvell Technology Group Ltd. 88SE9172 SATA III >> 6Gb/s RAID Controller (rev 11) >> >> There is nothing visible in dmesg nor logs that could give a clue >> where is the poor performance coming from: the xva was exported from >> XCP 1.1 in about 3 minutes, the import takes about 30 minutes >> (confirmed with few different xva's) and while importing the dom0 >> becomes extremely sluggish. >> >> Any help would be highly appreciated. >> >> Kind regards, >> S. >> >> _______________________________________________ >> Xen-api mailing list >> Xen-api@xxxxxxxxxxxxx >> http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api > > > > _______________________________________________ > Xen-api mailing list > Xen-api@xxxxxxxxxxxxx > http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api _______________________________________________ Xen-api mailing list Xen-api@xxxxxxxxxxxxx http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api

©2013 Xen Project, A Linux Foundation Collaborative Project. All Rights Reserved.
Linux Foundation is a registered trademark of The Linux Foundation.
Xen Project is a trademark of The Linux Foundation.