On Thu, Jan 14, 2010 at 8:20 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
>> @ novell say it's xen & ntp
>> @ ntp say it's novell & xen
>> @ xen say it's novell & ntp
>>
> That's why I suggested you use a workaround: use 2.6.18 kernel, either
> from RHEL or from xen.org :D
> If this works -> novell problem
> If this doesn't work -> xen problem
On Sat, Jan 16, 2010 at 5:05 AM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
> You might want to try latest pv_ops as well
> (http://wiki.xensource.com/xenwiki/XenParavirtOps), which should be
> easier to work with Opensuse since the version number is close.
it seems it's _not_ the kernel -- unless there's a coincident kernel
problem across source/vendor ...
per
http://lists.xensource.com/archives/html/xen-devel/2009-12/msg01127.html
http://wiki.xensource.com/xenwiki/XenParavirtOps
http://wiki.xensource.com/xenwiki/Kernel.org_Linux_on_Xen
cd /home/workspace && rm -rf linux-2.6-xen
git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
linux-2.6-xen
cd linux-2.6-xen
make clean
cp -a .config .config-old
wget -O .config
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.4-pvops_dom0-x86_64
make oldconfig
...
Xen PCI Frontend (XEN_PCIDEV_FRONTEND) [N/m/y/?] (NEW) <-- m
...
"IMQ" target support (NETFILTER_XT_TARGET_IMQ) [N/m/?] (NEW) <-- m
...
IMQ (intermediate queueing device) support (IMQ) [M/y/?] (NEW) <-- [enter]
...
Block-device tap backend driver (XEN_BLKDEV_TAP) [N/m/y/?] (NEW) <-- m
...
make bzImage
make modules
make modules_install
strip vmlinux -o vmlinux-stripped
gzip vmlinux-stripped -c > vmlinuz-gzipped
ls -al .config \
System.map \
arch/x86/boot/bzImage \
vmlinux \
vmlinux-stripped \
vmlinuz-gzipped
cp -a .config /boot/config-2.6.31.6
cp -a System.map /boot/System.map-2.6.31.6
cp -a arch/x86/boot/bzImage /boot/vmlinuz-2.6.31.6
mkinitrd
ls -al /boot/*2.6.31.6*
-rw-r--r-- 1 root root 98510 2010-01-16 03:02 /boot/config-2.6.31.6
-rw-r--r-- 1 root root 21304611 2010-01-16 04:14 /boot/initrd-2.6.31.6
-rw-r--r-- 1 root root 1940879 2010-01-16 03:14 /boot/System.map-2.6.31.6
-rw-r--r-- 1 root root 3751936 2010-01-16 03:14 /boot/vmlinuz-2.6.31.6
vi /boot/grub/menu.lst
...
title xen.git
root (hd0,0)
kernel /xen.gz loglvl=all loglvl_guest=all dom0_mem=1024M
vga=gfx-1280x1024x32 console=vga,com1 com1=57600,8n1
module /vmlinuz-2.6.31.6 root=/dev/VG0/ROOT rootfstype=ext4
rootflags=journal_checksum resume=/dev/VG0/SWAP nomodeset selinux=0
SELINUX_INIT=NO vga=0x31a console=tty0 console=xvc0,57600
module /initrd-2.6.31.6
title xen.git DISABLED
root (hd0,0)
kernel /vmlinuz-2.6.31.6 root=/dev/VG_SVR/LV_SVR_DOM0_ROOT
rootfstype=ext4 rootflags=journal_checksum
resume=/dev/VG_SVR/LV_SVR_DOM0_SWAP nomodeset showopts splash=silent
selinux=0 SELINUX_INIT=NO elevator=cfq vga=0x31a console=tty0
console=ttyS0,57600n8
module /initrd-2.6.31.6
...
boot to "xen.git"
uname -a
Linux test 2.6.31.6 #1 SMP Sat Jan 16 03:14:19 PST 2010 x86_64
x86_64 x86_64 GNU/Linux
lsb_release -a
LSB Version:
core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-x86_64:core-3.2-x86_64:core-4.0-x86_64:desktop-4.0-amd64:desktop-4.0-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch
Distributor ID: SUSE LINUX
Description: openSUSE 11.2 (x86_64)
Release: 11.2
Codename: n/a
service ntp stop
rm /etc/adjtime /var/
rm /var/lib/ntp/drift/ntp.drift
cat << EOF > /etc/sysconfig/clock
HWCLOCK="--utc"
SYSTOHC="yes"
TIMEZONE="America/Los_Angeles"
DEFAULT_TIMEZONE="US/Pacific"
EOF
hwclock --systohc --utc
service ntp start
sntp clock.isc.org && date && hwclock --utc --show
2010 Jan 16 04:37:09.000729 + 1.435060 +/- 0.028944 secs
Sat Jan 16 04:37:11 PST 2010
Sat 16 Jan 2010 04:37:11 AM PST -0.345191 seconds
... (wait ~ 6 hours) ...
date
Sat Jan 16 11:01:42 PST 2010
ntpq -p -c rv
assID=0 status=06c4 leap_none, sync_ntp, 12 events,
event_peer/strat_chg,
version="ntpd 4.2.4p8@xxxxxx Mon Dec 28 17:26:30 UTC 2009 (1)",
processor="x86_64", system="Linux/2.6.31.6", leap=00, stratum=2,
precision=-20, rootdelay=14.718, rootdispersion=135.995, peer=11390,
refid=66.220.9.122,
reftime=cefc89b2.a36f1342 Sat, Jan 16 2010 10:53:38.638, poll=6,
clock=cefc8b82.7e523feb Sat, Jan 16 2010 11:01:22.493, state=2,
offset=-115.130, frequency=-500.000, jitter=464.242, noise=29.343,
stability=154.680
remote refid st t when poll reach delay offset
jitter
==============================================================================
*clock.fmt.he.ne .PPS. 1 u 29 64 377 21.438 -811.68
462.837
+otc2.psu.edu 129.6.15.29 2 u 7 64 377 109.399 -850.99
470.522
+clock.isc.org .GPS. 1 u 7 64 377 21.440 -854.82
468.274
+clock.sjc.he.ne .CDMA. 1 u 49 64 377 16.889 -780.55
469.481
+zorro.sf-bay.or 216.218.254.202 2 u 59 64 377 20.366 -762.14
458.947
+nist1.aol-ca.tr .ACTS. 1 u 38 64 377 16.260 -795.87
463.170
boot to "xen.git DISABLED"
uname -a
Linux test 2.6.31.6 #1 SMP Sat Jan 16 09:14:19 PST 2010 x86_64 x86_64
x86_64 GNU/Linux
service ntp stop
rm /etc/adjtime /var/
rm /var/lib/ntp/drift/ntp.drift
service ntp start
... (wait ~ 10 minutes) ...
date
Sat Jan 16 11:15:05 PST 2010
ntpq -p -c rv
assID=0 status=0664 leap_none, sync_ntp, 6 events, event_peer/strat_chg,
version="ntpd 4.2.4p8@xxxxxx Mon Dec 28 17:26:30 UTC 2009 (1)",
processor="x86_64", system="Linux/2.6.31.6", leap=00, stratum=2,
precision=-20, rootdelay=22.750, rootdispersion=975.184, peer=43091,
refid=66.220.9.122,
reftime=cefc8c7c.35ca466a Sat, Jan 16 2010 11:05:32.210, poll=6,
clock=cefc8eb9.25103a1f Sat, Jan 16 2010 11:15:05.144, state=3,
offset=27.534, frequency=0.000, jitter=6.740, noise=16.331,
stability=0.000
remote refid st t when poll reach delay offset
jitter
==============================================================================
*clock.fmt.he.ne .PPS. 1 u 4 64 377 18.112 10.541
5.892
+otc2.psu.edu 147.84.59.145 2 u 64 64 377 101.103 12.106
8.621
+clock.isc.org .GPS. 1 u 57 64 377 14.990 4.830
9.622
+clock.sjc.he.ne .CDMA. 1 u 59 64 377 16.503 9.299
9.440
+zorro.sf-bay.or 216.218.254.202 2 u 56 64 377 22.212 6.323
11.031
+nist1.aol-ca.tr .ACTS. 1 u 60 64 377 17.076 14.316
9.260
in summary,
kernel OS/distro xen timekeeping
------------------------------------- --------------- ------- ------------
opensuse kernel-default-2.6.31.8-0.1 opensuse 11.2 (n/a) OK
opensuse kernel-default-2.6.32-41 opensuse 11.2 (n/a) OK
opensuse kernel-xen-2.6.31.8-0.1 opensuse 11.2 3.4.x NOISY/FAIL
opensuse kernel-xen-2.6.32-41 opensuse 11.2 3.4.x NOISY/FAIL
opensuse kernel-xen-2.6.31.8-0.1 opensuse 11.2 4.0.x NOISY/FAIL
opensuse kernel-xen-2.6.32-41 opensuse 11.2 4.0.x NOISY/FAIL
xen.git kernel-2.6.31.6 (pvops Dom0) opensuse 11.2 4.0.x NOISY/FAIL
xen.git kernel-2.6.31.6 opensuse 11.2 (n/a) OK
i.e.,
3 different kernel versions, from two different vendors, have
low-noise/accurate timekeeping in NON-xen configs.
boot any of those kernels with either v34x or v40x hypervisor in
place, and timekeeping suffers from unusably excessive jitter &
offset.
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
Home