search for: hendrych

On Mon, Sep 07, 2015 at 05:47:39PM +0200, Karel Hendrych wrote: > ... > > changing from: <driver name='file'/> to: <driver name='tap2'/> makes > the domain start without QEMU. > > However I see much better performance with QEMU (close to dom0, > tested using simple dd writes) than with tap2 driver. Is th...

On Sat, Sep 12, 2015 at 01:35:48AM +0200, Karel Hendrych wrote: > Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver > is achieving pretty much the same like dom0. > So you're measuring buffered speed. Try measuring non-buffered (iflag=direct or oflag=direct, depending if you're reading or writing). -- Pasi > Thanks...

Hi, spot on! On 6.9.2015 12:56, Pasi K?rkk?inen wrote: > On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote: >> Hi, after migrating to libvirt/libxl according to: >> > > Hi, > >> https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt >> >> I've noticed that my Xen PV domains are being launched by >> qemu-system-i386 running under root privileg...

...kStart/Xen4Libvirt I've noticed that my Xen PV domains are being launched by qemu-system-i386 running under root privileges. I am wondering why is this? Previously no qemu process was used. If qemu is needed for some reason, are there any guidelines for non-root operation? Thanks -- Karel Hendrych

...dd write speed is similar with tap2. I'll likely stay with the QEMU backend. Are there any best practises regarding security, at least if QEMU can operate under non-root account? Cheers -- Karel On 12.9.2015 10:51, Pasi K?rkk?inen wrote: > On Sat, Sep 12, 2015 at 01:35:48AM +0200, Karel Hendrych wrote: >> Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver >> is achieving pretty much the same like dom0. >> > > So you're measuring buffered speed. Try measuring non-buffered (iflag=direct or oflag=direct, depending if you're reading or writing)....

Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver is achieving pretty much the same like dom0. Thanks -- Karel On 7.9.2015 21:45, Pasi K?rkk?inen wrote: > On Mon, Sep 07, 2015 at 05:47:39PM +0200, Karel Hendrych wrote: >> ... >> >> changing from: <driver name='file'/> to: <driver name='tap2'/> makes >> the domain start without QEMU. >> >> However I see much better performance with QEMU (close to dom0, >> tested using simple dd writes) th...

On 11/01/2015 12:07 PM, Karel Hendrych wrote: > Hi, just a heads-up: 3.18.21 didn't boot up on HP ML310e Gen8 v2, SATA drives in AHCI mode, / on software raid 1, no LVM. It ended up in kernel panic > with unable to mount root fs. Attached. No difference in grub kernel/xen settings. > > I didn't investigate the thing...

...o dom0, tested using simple dd writes) than with tap2 driver. Is that expected? What's best practise to file based storage on latest CentOS6-xen (Kernel 3.18.17, Xen 4.4.2-7) Are there any guides around running QEMU on CentOS6-xen as non-root user? Cheers -- Karel On 7.9.2015 17:42, Karel Hendrych wrote: > Hi, spot on! > > > On 6.9.2015 12:56, Pasi K?rkk?inen wrote: >> On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote: >>> Hi, after migrating to libvirt/libxl according to: >>> >> >> Hi, >> >>> https://wiki.centos.org...

On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote: > Hi, after migrating to libvirt/libxl according to: > Hi, > https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt > > I've noticed that my Xen PV domains are being launched by > qemu-system-i386 running under root privileges. > > I am wondering why i...

Hi, is there any guide for CPU microcode updates on CentOS6, Xen 4.10, kernel 4.9 ? Thanks Karel

...reboot just like any other centos machine. Feel free to jump in if I missed any steps/caveats/notes, but that looks to be how I set it up on my machines last year. Thanks, -Dave > On May 16, 2019, at 12:03, Sarah Newman <srn at prgmr.com> wrote: > > On 5/16/19 2:12 AM, Karel Hendrych wrote: >> Hi, >> >> is there any guide for CPU microcode updates on CentOS6, Xen 4.10, kernel 4.9 ? > > I'm not sure off the top of my head. > > You can add ucode=scan to the xen command line, add a file /path/to/microcode_file as the last item in your boot list...

On 01/27/2017 06:08 AM, Karel Hendrych wrote: > Have you tried to eliminate all power management features all over? I've been trying to find and disable all power management features but having relatively little luck with that solving the problems. Stabbing the the dark I've tried different ACPI settings, including complete...

Hi, I am seeing frequent libvirtd hangs (clients not responding) after last CentOS6-Xen update : libvirt-libs-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-driver-network-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-driver-nwfilter-4.1.0-2.xen46.el6.x86_64 libgcc-4.4.7-18.el6_9.2.x86_64 2:qemu-img-0.12.1.2-2.503.el6_9.5.x86_64

Indeed, a good catch. Module initramfs line was missing at 3.18.21 grub config. Thanks! -- Karel On 1.11.2015 21:46, Sarah Newman wrote: > On 11/01/2015 12:07 PM, Karel Hendrych wrote: >> Hi, just a heads-up: 3.18.21 didn't boot up on HP ML310e Gen8 v2, SATA drives in AHCI mode, / on software raid 1, no LVM. It ended up in kernel panic >> with unable to mount root fs. Attached. No difference in grub kernel/xen settings. >> >> I didn't invest...

On 5/16/19 2:12 AM, Karel Hendrych wrote: > Hi, > > is there any guide for CPU microcode updates on CentOS6, Xen 4.10, kernel 4.9 ? I'm not sure off the top of my head. You can add ucode=scan to the xen command line, add a file /path/to/microcode_file as the last item in your boot list, and generate that microcode fi...

Hi, does sieve plugin in 1.0.15 support fileinto subdirectory? There is a maildir .oss.dovecot and sieve rule: if envelope :contains "to" "k+dovecot" { fileinto "oss.dovecot"; } But I get LDA error: Couldn't open mailbox dovecot: Mailbox doesn't exist: dovecot Any suggestions? Delivery to non-subdirectories is working fine. Regards -- Karel

I have released to the master mirror the following packages for Xen4CentOS: b518e3b0fd4f735b34d7784815793cb787283d9029776bd9794cedeb274b9204 kernel-3.18.21-16.el6.x86_64.rpm 4b17373a0ef6806b26d02eb87fc299020beb60b6e31ed08a9c57d30a1410fbe7 kernel-devel-3.18.21-16.el6.x86_64.rpm cacedf6771849f7525145ad4ed7d36a2cad5b49b546173bb7c132b236cb7ac49 kernel-doc-3.18.21-16.el6.noarch.rpm

>Are there other kernel options that might be useful to try? pci=nomsi https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1521173/comments/13 On 27 January 2017 at 18:21, Kevin Stange <kevin at steadfast.net> wrote: > On 01/27/2017 06:08 AM, Karel Hendrych wrote: > > Have you tried to eliminate all power management features all over? > > I've been trying to find and disable all power management features but > having relatively little luck with that solving the problems. Stabbing > the the dark I've tried different ACPI sett...

Bump. Folks, any ideas? Cheers Karel On 22.5.2018 11:33, Karel Hendrych wrote: > Hi, I am seeing frequent libvirtd hangs (clients not responding) after > last CentOS6-Xen update : > > libvirt-libs-4.1.0-2.xen46.el6.x86_64 > libvirt-daemon-4.1.0-2.xen46.el6.x86_64 > libvirt-daemon-driver-network-4.1.0-2.xen46.el6.x86_64 > libvirt-daemon-driver-nwf...

On 28/01/17 05:21, Kevin Stange wrote: > On 01/27/2017 06:08 AM, Karel Hendrych wrote: >> Have you tried to eliminate all power management features all over? > > I've been trying to find and disable all power management features but > having relatively little luck with that solving the problems. Stabbing > the the dark I've tried different ACPI sett...