similar to: RE: x86-64 Net Performance [was: Opteron server and NUMA]

Hi Everyone, I am running 3.2.1 on Centos 5.2 with HAP enabled, NUMA enabled, ACPI enabled and the dom0 allocated 512Mb. I have setup a single core 1Gb VM for performance testing under Windows 2008 Server. Most CPU results are within a few percent of theoretical max but Memory performance is about half what I expected. I get 3.22Gb/Sec Sandra 2009 Memory performance for a single Opteron 8350

Hi, The Gentoo-Wiki about Xen suggests, to add "-mno-tls-direct-seg-refs" to CFLAGS and to recompile the whole system. So it seems, NPTL will work without problems (and without performance drawback) after that. Sweet! But i carefully read http://wiki.xensource.com/xenwiki/XenSpecificGlibc, and it says: "On 32-bit x86 platforms, Xen uses segmentation to provide protection of the

Hello, We [the Debian Xen package team] are currently working on Xen packages, and are planning to include them into Debian. A current issue in Xen, is the libc problem. From the Xen wiki [1]: "Xen uses segmentation to provide protection of the memory used for the hypervisor. This results in some performance issues since wrap-around segments as used by glibc need expensive extra handling.

The patchset will add basic NUMA support to Xen (hypervisor only). We borrowed from Linux support for NUMA SRAT table parsing, discontiguous memory tracking (mem chunks), and cpu support (node_to_cpumask etc). The hypervisor parses the SRAT tables and constructs mappings for each node such as node to cpu mappings and memory range to node mappings. Using this information, we also modified the

Hi folks, we are using a Tyan TK8W 2885 Mainboard (latest BIOS) w/ 2 Dual Core Opteron 280EE and 8GB of RAM (4GB per Socket). Furthermore we run CentOS 5.1 w/ Xen 3.2.1. (build from SRPM). We also tried 3.2.0. I tried both, the CentOS 5.1 Xen Kernel as well as the latest RHEL 5.2 Kernel but we do not get two NUMA domains as we (in my opinion) are supposed to. Do we need to recompile anything?

Dear All, I found Andy Liaw's suggestion about using a NUMA (instead of SMP) kernel when running R on amd64 with > 1 CPU http://finzi.psych.upenn.edu/R/Rhelp02a/archive/35109.html A couple of questions: 1. Is this still the case with the newer dual-core opterons (e.g., the 275 et al., families) running Linux (kernel 2.6)? 2. How does this affect using Rmpi (and snow, papply, et al.)

Hi Martin, When I attended the LinuxWorld Expo in NYC back in January, I chatted with some folks at the AMD booth, as well as guys from Penguin Computing (where we bought our Opteron box). I was told that the Operton has this somewhat strange setup that the memory is controlled by one CPU. The net effect of this being that when both CPUs are running, one might only be running at around 90%

Hey, On Mon, Feb 27, 2012 at 10:26 PM, Linus van Geuns <linus@vangeuns.name> wrote: > Hey, > > I am currently considering a two machine Xen setup based on AMD Opterons, > more precisely Dell R515s or R415s with dual Opteron 4274HE. > Does anyone has some Xen setup(s) running on top of Opterons 4274HE, Opteron > 4200 or Dell R515 machines and is willing to share some

Hi, I am a Masters student from Carnegie Mellon University. I am looking for a research topics for an Advanced OS & DS course we have. I wanted to know what is the current support for NUMA on Xen ? Does it support the IBM x440 and AMD64 Opteron ? Also, does the Xen scheduler do NUMA aware scheduling so it does not degrade the VM performace ? My group is currently looking into Scheduling

Package: xen-hypervisor-4.0-amd64 Version: 4.0.1-4 Severity: important *** Please type your report below this line *** Hello Debian Team, I have some strange behavior with a DL585 G7 with only two cpu sockets used (Opteron 6238 Interlagos). I use Debian 6.0 with a XEN Kernel. Every time when I start a DomU, the server makes a hard reset without any kernel panic or output. When I start the

> From: Douglas Bates [mailto:bates at bates4.stat.wisc.edu] > > "Liaw, Andy" <andy_liaw at merck.com> writes: > > > Sorry. I need to retract my claim. There seems to be a 3G > limit, even > > though the OS could handle nearly 8G. (I can have two > simultaneous R > > processes each using near 3G.) > > > > On another note, on

> From: Douglas Bates [mailto:bates at bates4.stat.wisc.edu] > > "Liaw, Andy" <andy_liaw at merck.com> writes: > > > Sorry. I need to retract my claim. There seems to be a 3G > limit, even > > though the OS could handle nearly 8G. (I can have two > simultaneous R > > processes each using near 3G.) > > > > On another note, on

> From: Douglas Bates > > How does the Opteron perform on floating point? Can you try something > like > > > mm = matrix(rnorm(1e6), nc = 1e3) > > system.time(crossprod(mm)) > [1] 0.51 0.02 0.53 0.00 0.00 > > system.time(crossprod(mm)) > [1] 0.37 0.03 0.40 0.00 0.00 > > system.time(crossprod(mm)) > [1] 0.38 0.02 0.40 0.00 0.00 > >

I was offered an upgrade path for my two Dell 1750's (2.8 Dual Xeon) to get into a pair of new Dual Core Dual Opteron servers. Assuming I can get the IRQ BS worked out so my TE411XP doesn't flip out, this should be a pretty significant upgrade. Has anyone been able to quantify any benefits to using one processor over the other? Should I wait for the newer Intel processors this summer

Greetings, I have 3 SLES 10 SP3 servers running Xen (3.2.3). The motherboard is a Tyan S3992 h2000M and I have dual quad-core AMD Opterons wit 8GiB RAM. The board''s BIOS is up to date. When I boot the Xen kernel, memory performance seems very slow: $ time memhog 100m mbind: Function not implemented get_mempolicy: Function not implemented .......... real 0m1.117s user 0m0.148s sys

I'm putting together a spec for a big(ger) memory x86_64 host, and I hope some of you-all can help. I'm looking for success stories of hardware that folks are using in production environments, preferably with CentOS 4, with more than 4GB of memory per CPU. I know there are lots of mobos out there that can do this, but I'm looking for what folks really have running. Call me

Hi, I was wondering if anyone has had good experiences using R on Linux with dual AMD64 (Opteron) processors. I'm thinking of buying a couple of such servers, but I'd like to make sure R would work fine. The "R Installation and Administration" guide notes that there may be some problems with BLAS libraries. That's all I could find about R on AMD64. Please share your

Solved. For the archives: Noticed in xl info output that only 1 core was recognised, even though nr_cpus should show 16 on this box. Tried rebooting and selecting the old .34 kernel, console printed "smpboot: do_boot_cpu failed(-1) to wakeup CPU#1" and CentOS failed to boot. Powered down the box fully and started back up with the latest .44 kernel and everything is working fine

The subject says it all really, I''m pretty sure the system and bios are NUMA aware but I''m not sure if it''s enabled? Is it supported in 3.2.1 stable? Thanks, Rob \ \/ /___ _ __ |___ / |___ \ / | \ // _ \ ''_ \ |_ \ __) | | | / \ __/ | | | ___) | / __/ _| | /_/\_\___|_| |_| |____(_)_____(_)_| (XEN) Xen version 3.2.1

Hey, I am currently considering a two machine Xen setup based on AMD Opterons, more precisely Dell R515s or R415s with dual Opteron 4274HE. Does anyone has some Xen setup(s) running on top of Opterons 4274HE, Opteron 4200 or Dell R515 machines and is willing to share some experience? In particular, I am interested in using Debian squeeze (Xen 4.0.1, Linux 2.6.32) for dom0 and most domUs. Any