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

--- Comment #49 from rai...@ultra-secure.de ---
I switched back the OS-type to FreeBSD 10 64bit.
I also booted back into a stock kernel and then the XENTIMER-LAPIC change went
through without a freeze.


I recompiled (a clean source-tree) with your patch and now I get about 26MB/s.

dmesg:
Copyright (c) 1992-2016 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 11.0-RELEASE-p7 #2: Sat Feb 11 14:46:26 CET 2017
    root@freebsd11:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on LLVM
3.8.0)
VT(vga): text 80x25
CPU: Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz (2593.55-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x306e4  Family=0x6  Model=0x3e  Stepping=4
 
Features=0x783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2>
 
Features2=0xc3ba2203<SSE3,PCLMULQDQ,SSSE3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,RDRAND,HV>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  Structured Extended Features=0x200<ERMS>
Hypervisor: Origin = "XenVMMXenVMM"
real memory  = 8585740288 (8188 MB)
avail memory = 8265371648 (7882 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <Xen HVM>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 2 package(s)
random: unblocking device.
ioapic0: Changing APIC ID to 1
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 1.1> irqs 0-47 on motherboard
random: entropy device external interface
kbd1 at kbdmux0
netmap: loaded module
module_register_init: MOD_LOAD (vesa, 0xffffffff8101c970, 0) error 19
random: registering fast source Intel Secure Key RNG
random: fast provider: "Intel Secure Key RNG"
vtvga0: <VT VGA driver> on motherboard
cryptosoft0: <software crypto> on motherboard
acpi0: <Xen> on motherboard
acpi0: Power Button (fixed)
acpi0: Sleep Button (fixed)
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 62500000 Hz quality 950
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <32-bit timer at 3.579545MHz> port 0xb008-0xb00b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc220-0xc22f at device 1.1 on pci0
ata0: <ATA channel> at channel 0 on atapci0
ata1: <ATA channel> at channel 1 on atapci0
uhci0: <Intel 82371SB (PIIX3) USB controller> port 0xc200-0xc21f irq 23 at
device 1.2 on pci0
usbus0: controller did not stop
usbus0 on uhci0
pci0: <bridge> at device 1.3 (no driver attached)
vgapci0: <VGA-compatible display> mem
0xf0000000-0xf1ffffff,0xf3000000-0xf3000fff irq 24 at device 2.0 on pci0
vgapci0: Boot video device
pci0: <mass storage, SCSI> at device 3.0 (no driver attached)
re0: <RealTek 8139C+ 10/100BaseTX> port 0xc100-0xc1ff mem 0xf3001000-0xf30010ff
irq 32 at device 4.0 on pci0
re0: Chip rev. 0x74800000
re0: MAC rev. 0x00000000
miibus0: <MII bus> on re0
rlphy0: <RealTek internal media interface> PHY 0 on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto, auto-flow
re0: Using defaults for TSO: 65518/35/2048
re0: Ethernet address: 02:00:2b:42:00:12
re0: netmap queues/slots: TX 1/64, RX 1/64
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
fdc0: No FDOUT register!
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
Timecounters tick every 1.000 msec
nvme cam probe device init
usbus0: 12Mbps Full Speed USB v1.0
ugen0.1: <Intel> at usbus0
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
ada0 at ata0 bus 0 scbus0 target 0 lun 0
ada0: <QEMU HARDDISK 0.10.2> ATA-7 device
ada0: Serial Number QM00001
ada0: 16.700MB/s transfers (WDMA2, PIO 8192bytes)
ada0: 25600MB (52428800 512 byte sectors)
uhub0: 2 ports with 2 removable, self powered
ada1 at ata0 bus 0 scbus0 target 1 lun 0
ada1: <QEMU HARDDISK 0.10.2> ATA-7 device
ada1: Serial Number QM00002
ada1: 16.700MB/s transfers (WDMA2, PIO 8192bytes)
ada1: 51200MB (104857600 512 byte sectors)
ada2 at ata1 bus 0 scbus1 target 0 lun 0
ada2: <QEMU HARDDISK 0.10.2> ATA-7 device
ada2: Serial Number QM00003
ada2: 16.700MB/s transfers (WDMA2, PIO 8192bytes)
ada2: 51200MB (104857600 512 byte sectors)
cd0 at ata1 bus 0 scbus1 target 1 lun 0
cd0: <QEMU QEMU DVD-ROM 0.10> Removable CD-ROM SCSI device
SMP: AP CPU #1 Launched!
cd0: Serial Number QM00004
cd0: 16.700MB/s transfers (WDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
Trying to mount root from zfs:zroot/ROOT/default []...
Root mount waiting for: usbus0
ugen0.2: <QEMU 0.10.2> at usbus0
re0: link state changed to UP
ums0: <Endpoint1 Interrupt Pipe> on usbus0
ums0: 3 buttons and [Z] coordinates ID=0

>From what I know, there is no configuration-file for the guests in XenServer -
it's stored in a DB. Is there still a way to extract how the VM is configured
on the Dom0-side?

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