similar to: domU machines hang when Hyperthreading enabled in BIOS

Hi, I have two boxes with 2 * Xeon 3.0 Ghz I''ve enabled Hyperthreading in the BIOS. - One box is with Xen 3.0.1 I''ve enabled SMP + SMT in my kernel Xen0 config, and SMP + SMT works perfectly. I can see 4 cpus in my VCPU list for Domain0, and I see also 4 CPUs in the /proc/cpuinfo file. - One box is with Xen 3.0.2 I''ve enabled SMP in my kernel Xen0 config, and SMT has

I ran some iperf tests today and it looks like the etherbridge is the limiting factor on throughput. In the beforetime, I saw great throughput to the VMs; over 800 Mbps. With the bridge, the numbers are in the 400s somewhere. Is this the speed I can expect from the bridge? Is there some tuning I should try, or another way to get more bandwidth into the VMs? This is with xen-2.0, 2.4.27-xen0

Hi, with regards Intels L1TF vulnerabilities, it seems they are somewhat non-committal on whether turning off HyperThreading is required, suggesting people > Consult with your hypervisor vendor for more guidance. https://www.intel.com/content/www/us/en/architecture-and-technology/l1tf.html#faq-answers-10-0 What is the consensus in the Libvirt community about the risks (or not) of leaving

I am running irqbalance with default configuration on an Atom 330 machine. This CPU has 2 physical cores + 2 SMT (aka Hyperthreading) cores. As shown below the interrupt for the eth0 device is always on CPUs 0 and 1, with CPUs 2 and 3 left idle. But why? Maybe irqbalance prefers physical cores? My understanding, though, is that the even-numbered CPUs are the physical cores, with the

Hi, I understand that 64-bit support for xen (from the side of host OSes) will be a little late, so i have a couple of questions: 1) Can i install a x86 32-bit xen kernel on x86_64 pc, without problems? 2)If i install a x86_64 xen kernel, can i run 32-bit host OSes on it? I know little about Xen, so i''d like to clear these out. Thanks

All, I seem to be experiencing the same problem that Michal Urbanski talked about in an email dated March 24th with a subject of "hanging dell hardware". Looking through the archives I can not find any resolution to the problem. The specs on my machine are Dell Poweredge 1850 Dual Xeon 2.8s 1gig ram PERC 4e/SI raid controller in mirror configuration with 2 73 gb drives (uses the

CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 drivers/built-in.o: In function `vmcoreinfo_show'': /usr/src/linux-2.6.18-xen.hg/drivers/xen/core/xen_sysfs.c:340: undefined reference to `vmcoreinfo_size_xen'' /usr/src/linux-2.6.18-xen.hg/drivers/xen/core/xen_sysfs.c:340: undefined reference to `paddr_vmcoreinfo_xen'' make[4]: ** [.tmp_vmlinux1]

Are they any issues still with hyperthreading processors, I've read and been told by a few people to make sure its disabled in bios if I want to use * on a hyperthreading machine. Kind Regards, Chris Bond

My Dell 2800 Dual 64bit Proc. machine came in with hyperthreading enabled. (they call it virtual processor??) I have been intending for a month to disable it. Tonight, I rebooted, turned it off, and let the system come up. zaptel loaded and asterisk loaded, but both of my t1s were red. (it is a TE411P) /proc/interrupts looked OK, zttest gave OK numbers. I doublechecked all of the files in case

Hi, I have been trying to get Hyperthreading to work in a Windows HVM on Xen 4.1.2 as described in ''xmexample.hvm''. I think I have set it up correctly, but I can''t seem to get it to work. There is not much documentation on it and most topics are from years ago. I''m curious to know to whether this functionality is still supposed to work. I''m aware that

i just ran install.sh from the xen 3.0.2 pre-built distribution. in /boot it put vmlinuz-2.6.16-xen vmlinuz-2.6-xen -> vmlinuz-2.6.16-xen what happened to the xen0 and xenU kernels? also in /boot from xen 3.0.1 is vmlinuz-2.6-xen0 -> vmlinuz-2.6.12.6-xen0 vmlinuz-2.6-xenU -> vmlinuz-2.6.12.6-xenU which is what i expected from xen 3.0.2. don

Hello, I read an interesting article on 2cpu.com that talks about the performance differences between a P4 processor with Hyperthreading(HT) enabled and disabled. http://www.2cpu.com/articles/ht_explored/index.html The bottom line of the article is that processor intensive applications greatly benefit from HT being enabled, but memory intensive applications can actually see a slight decrease in

Hello. Up to version 3.0.4, I did the following to get two xen kernels (dom0 and domU) with my own config: wget http://www.cl.cam.ac.uk/Research/SRG/netos/xen/downloads/... make xen make tools make docs make linux-2.6-xen0-config CONFIGMODE=menuconfig make linux-2.6-xen0-build make linux-2.6-xen0-install make linux-2.6-xen0-dist make linux-2.6-xenU-config CONFIGMODE=menuconfig make

That's the problem we had with Asterisk and HT on a 2.4 Kernel: whenever Asterisk was staying in the RTP stream, and HT was enabled (on a Dell Dual Xeon system), we had choppy audio. After disabling HT, everything was fine again. Nothing measurable, indeed, but you could definitely hear it. So there *must* be something. -Manuel -----Messaggio originale----- Da: Peter Corlett

We have tested the latest xen on VT platform with Intel 915/E8500 chipset. Here is the test summary: Issues: - Cannot boot Windows 2000 - Only one CPU is detected in SMP dom0 - Destroying VMX with 4G memory may make xend hang on IA-32e IA-32: + Build&Boot UP xen0 without problem + Can bootup unmodified IA-32 2.4/2.6 linux in VMX domain + Can bootup unmodified IA-32 WindowsXP SP1/SP2

Hello, please can someone on the list point me to the right direction how to build xen0 and xenU kernels for linux-2.6.27-xen.hg? A make world KERNELS="linux-2.6-xen0 linux-2.6-xenU" leads me to the error: select-linux-arch: x86 select-linux-image: cannot determine Linux image to use for x86 in build-linux-2.6.27-xen0_x86_32 cp: missing destination file operand after

I just tried to install CentOS (x86_64 4.4 and i386 4.3, not both at once, when I found the 64bit version didn't boot, I tried the 32bit version, same result) on a dual Naconda Xeon system. I get an OOPS just after the IDE info is printed on the screen during boot (this is booting off the CD during the install phase). After mucking about with the bios settings (and many reboots later), I

I am installing Xen on a remote server. I left the other kernels on the grub.conf and made xen the default to boot from. The box didn''t boot into Xen on reboot but I''m not sure why. Here is my Xen config file: # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that #

We have tested latest xen on VT platform with Intel 915/E8500 chipset.Here is the test summary. Issues: - IA-32 VMX guest will hang when booting on IA-32PAE host with acpi=1 and apic=1.(Bug 594) - Failed to created VMX after tens of VMXs have been created & destroyed on IA-32e.(Bug593) IA-32: Build&Boot SMP xen0 without problem Can bootup unmodified IA-32 2.4/2.6 linux in VMX

I am seeing a kernel message, "hdc: lost interrupt", when running LTP on the xen0 domain. The first time I saw the ''kernel: hdc: lost interrupt'' in /var/log/messages, I was running LTP on both xen0 and xenU domains. The xenU domain was totally hung at this point. Suspecting a setup error, I re-checked the installation and reran LTP on xen0 alone, without having