[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-users] Guest disk (LVM on SSD) too slow. Xen unstable, DomU-win XP sp2
nice time, Xen community. my DomU has very slow Disk performance, despite the usage of SSD's. Maybe somebody can give some good tips to accelerate, or point out my mistakes. DomU CristalDiskMark 3.0.1 test(roundet): seq (R/W) :71 / 86 MB/s 512k(R/W) :76 / 80 MB/s 4K(R/W) :4 / 3 MB/s 4K QD32(R/W):4 / 4 MB/s The same guest running in KVM-Qemu (standard installed on Ubuntu 12.04) has: seq (R/W) :319 / 146 MB/s 512k(R/W) :306 / 143 MB/s 4K(R/W) :10 / 7 MB/s 4K QD32(R/W):12 / 9 MB/s Need only Xen because of second graphic card pass through (here works fine).. I have: intel e5-1620, 64 GB uDDR @1333Mgz, Dom0 on SSD OCZ Vertex4(@SATA3 port). Second SSD OCZ Agility 3 (@SATA3 port) with LVM 2 only for DomU. Kernel (3.4.7) + Xen unstable(rev 25705, Aug 02 14:44:53 2012 +0100) self compiled (according to Manual of Teo En Ming) DimU: Windows XP sp 2 # lvdisplay File descriptor 8 (pipe:[16062]) leaked on lvdisplay invocation. Parent PID 4821: bash --- Logical volume --- LV Name /dev/SSDagility/win_xp VG Name SSDagility LV UUID IsYry9-rirf-G7oW-WSVC-fUOI-0VV1-TnQcIA LV Write Access read/write LV Status available # open 2 LV Size 58,59 GiB Current LE 15000 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 252:0 .... --------------------------DomU configuration file------------------------ name = "winxp" #kernel = "/usr/lib/xen/boot/hvmloader" firmware_override = "/usr/lib/xen/boot/hvmloader" builder='hvm' #device_model_stubdomain_override = 1 #device_model='qemu-dm' #device_model='stubdom' #device_model='stubdom-dm' #device_model='qemu-xen' memory = 3096 vcpus=4 boot='cd' disk = [ 'phy:/dev/SSDagility/win_xp,sda,rw', 'file:/home/looser/Downloads/wind_xp.iso,hdb:cdrom,r'] on_reboot = 'restart' on_crash = 'restart' keymap = "de" sdl=1 stdvga=1 serial='pty' pci = ['04:00.0', '04:00.1'] pci_power_mgmt=1 pci_msitranslate=1 xen_platform_pci=1 viridian=1 #High Precision Event Timer hpet=1 pae=0 #Advanced Configuration and Power Interface acpi=1 #Advanced Programmable Interrupt Controller apic=1 gfx_passthru=0 --------------------------END DomU config ------------------------ to start DomU I do: xl -f create winxp in DomU, Windows detected IDE-Controller: Intel 82371SB-PCI-Bus-Master-IDE-Controller HDD detected: QEMU HARDDISK (disabling write cache don't work, after reboot it will be automatically activated back) For good and functioning tip and I'm buying beer :) Best thanks. Denis. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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