[Bug 212681] I/O is slow for FreeBSD DOMu on XenServer

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212681

--- Comment #12 from Sydney Meyer <meyer.sydney at gmail.com> ---
I have some 10.3 vm's running on Xen 4.4 with a Debian Linux 4.6 Dom0 and they
give me:

dmesg

xenbusb_back0: <Xen Backend Devices> on xenstore0
xbd0: 5120MB <Virtual Block Device> at device/vbd/51712 on xenbusb_front0
xbd0: features: flush, write_barrier
xbd0: synchronize cache commands enabled.
xn0: backend features: feature-sg feature-gso-tcp4

sysctl -a | grep xen

kern.vm_guest: xen
device  xenpci
vfs.pfs.vncache.maxentries: 0
dev.xenbusb_back.0.%parent: xenstore0
dev.xenbusb_back.0.%pnpinfo: 
dev.xenbusb_back.0.%location: 
dev.xenbusb_back.0.%driver: xenbusb_back
dev.xenbusb_back.0.%desc: Xen Backend Devices
dev.xenbusb_back.%parent: 
dev.xn.0.xenstore_peer_path: /local/domain/0/backend/vif/3/0
dev.xn.0.xenbus_peer_domid: 0
dev.xn.0.xenbus_connection_state: Connected
dev.xn.0.xenbus_dev_type: vif
dev.xn.0.xenstore_path: device/vif/0
dev.xn.0.%parent: xenbusb_front0
dev.xbd.0.xenstore_peer_path: /local/domain/0/backend/vbd/3/51712
dev.xbd.0.xenbus_peer_domid: 0
dev.xbd.0.xenbus_connection_state: Connected
dev.xbd.0.xenbus_dev_type: vbd
dev.xbd.0.xenstore_path: device/vbd/51712
dev.xbd.0.%parent: xenbusb_front0
dev.xenbusb_front.0.%parent: xenstore0
dev.xenbusb_front.0.%pnpinfo: 
dev.xenbusb_front.0.%location: 
dev.xenbusb_front.0.%driver: xenbusb_front
dev.xenbusb_front.0.%desc: Xen Frontend Devices
dev.xenbusb_front.%parent: 
dev.xctrl.0.%parent: xenstore0
dev.xenstore.0.%parent: xenpci0
dev.xenstore.0.%pnpinfo: 
dev.xenstore.0.%location: 
dev.xenstore.0.%driver: xenstore
dev.xenstore.0.%desc: XenStore
dev.xenstore.%parent: 
dev.xenpci.0.%parent: pci0
dev.xenpci.0.%pnpinfo: vendor=0x5853 device=0x0001 subvendor=0x5853
subdevice=0x0001 class=0xff8000
dev.xenpci.0.%location: pci0:0:2:0 handle=\_SB_.PCI0.S2__
dev.xenpci.0.%driver: xenpci
dev.xenpci.0.%desc: Xen Platform Device
dev.xenpci.%parent: 
dev.xen_et.0.%parent: nexus0
dev.xen_et.0.%pnpinfo: 
dev.xen_et.0.%location: 
dev.xen_et.0.%driver: xen_et
dev.xen_et.0.%desc: Xen PV Clock
dev.xen_et.%parent: 
dev.xen.xsd_kva: 18446735281894703104
dev.xen.xsd_port: 3
dev.xen.balloon.high_mem: 0
dev.xen.balloon.low_mem: 0
dev.xen.balloon.hard_limit: 18446744073709551615
dev.xen.balloon.driver_pages: 0
dev.xen.balloon.target: 129024
dev.xen.balloon.current: 129024

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