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Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a

To: Mike Viau <viaum@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 3 Mar 2010 11:18:44 +0200
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On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
> >Any just first argument dummy=dummy should on kenel line.
> > Read Wiki one more time. It works.
> 
> I believe you that it does work. I was able to see (XEN) messages coming from 
> the hypervisor, but no matter how I changed the option I kept getting a 
> kernel fault.
> 
> I feel like it was time to stop mucking around with getting Ubuntu and the 
> grub2 boot loader to work with XEN so I decided to install a headless 
> OpenSUSE 11.2 system.
> 
> The openSUSE distribution supported Xen 3.4.1 tools, and had a 2.6.31.12 
> xenified kernel. On this setup I experience identical network performance.
> 
> ~1MB/s - w/ xen kernel
> ~4.5 MB/s - w/ non-xen kernel
> 
> I use the e1000e kernel module driver for my Ethernet card.
> 
> Is this typical Dom0 (or Xen Host) network performance with a xenified kernel 
> or is just in my two setups that one encounters such a network performance 
> hit to the Dom0?
>

No, it's not typical.

How are you measuring the performance? In a gigabit network you should be able
to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.
 
-- Pasi

> -M
> 
> --- On Mon, 3/1/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:
> 
>   From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
>   Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput 
> of a XEN kernel?
>   To: bderzhavets@xxxxxxxxx
>   Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
>   Date: Monday, March 1, 2010, 2:52 PM
> 
>   Why using grub2 vs grub is baffling am not sure....
> 
>   I think I'd prefer to use the kernel command line in grub2 so that the 
> options may be changed easier laster on. However I still have been having so 
> success with boot
>   XEN with Ubuntu's grub2 boot loader.
> 
>   Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to pass 
> kernel options?
>   [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
> 
>   I have read through the Wiki page at 
> [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a 64-bit 
> Xen Hypervisor.
> 
>   Thus far I have been having no success with using the example entry found 
> at 
> [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
> 
>   A question regarding that entry is what would be the root device when there 
> are separate /boot and root partitions? I am using the partition with the 
> /boot (grub2) as
>   my 'set root' device right?
> 
>   I am also using the dummy=dummy as the first option on the first module 
> line, again as discovered on the wiki.
> 
>   Additionally posted on another thread here in the Xen mailing list was:
> 
>  > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xxxxxxxxx> wrote:
>  >>
>  >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen any more
>  >> because of the presence of GRUB2 * the new boot loader doesn*t support
>  >> passing certain command lines and the current multiboot implementation
>  >> breaks the method Xen uses to load the
>   Dom0 kernel * you can*t use Ubuntu
>  >> 9.10 Server with Xen.
> 
>  I am confused now because Boris clearly created a wordpress.com weblog in 
> where Ubuntu 9.10 Server was
>  used with XEN.
> 
>  Lastly, out of curiosity, what (or what kind) of commands cannot be passed 
> with GRUB2?
> 
>  ThX!
> 
> 
>   -M
> 
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>   Date: Sat, 27 Feb 2010 11:20:31 -0800
>   From: bderzhavets@xxxxxxxxx
>   Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput 
> of a XEN kernel?
>   To: mike.viau@xxxxxxxxxxxxxxx
>   CC: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
> 
>   In Xen Wiki is mentioned , that parameters for kernel may be set via 
> command line as follows:-
>   
> ************************************************************************************************************
>   module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro 
> console=tty0
>   
> ************************************************************************************************************
>   # cat /proc/cmdline
> 
>   shows that GRUB2 skips first argument, what causes problem.
> 
>   Compiling built-in CMD_LINE is just an option.
>   Read all Wiki written by Pasi and  you would never be surprised ;)
> 
>   > P.S: What is your feeling on using a recent Ubuntu system with
>   > grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 
> > package as well too...
> 
>   I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 
> ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3
> 
>   1.)  2.6.32.9 PVOPS
>   2.)  2.6.31.6 PVOPS
>   3.)  2.6.31.12 xenified
> 
>   with no problems with dummy=dummy as first parameter ( thanks Pasi).
>   It may also may be done via compiling kernels with built-in CMD_LINE.
>   It works fine as well.
> 
>   Boris.
> 
>   --- On Sat, 2/27/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:
> 
>     From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
>     Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput 
> of a XEN kernel?
>     To: bderzhavets@xxxxxxxxx
>     Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
>     Date: Saturday, February 27, 2010, 12:03 PM
> 
>     Yes, thank you Boris for pointing that out. I found that was defiantly 
> true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2 xen kernel and 
> the xenified
>     2.6.31.12.
> 
>     Additionally I found that:
> 
>     Xend does not start when using pv_ops dom0 kernel?
> 
>     In December 2009 pv_ops dom0 kernel modules were renamed to have a "xen-" 
> prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
> 
>     This makes Xen 3.4.x xend fail to start, because it tried to load 
> "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko" and 
> then start xend. Fedora 12
>     xen-3.4.2-2 rpms have this problem fixed.
> 
>     Also make sure you have xenfs mounted to "/proc/xen", that's needed 
> aswell.
> 
>     [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
> 
>     And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed 
> this problem.
> 
>     Lastly I am still doing some reading on the grub2 package and how to 
> configure it. It turns out that I have been using grub-legacy (or just good 
> old grub) for so long
>     that configuring the grub2 boot loader is turning out to be my own 
> personal kryptonite.
> 
> 
> 
>     I am still working on getting the hypervisor to load the dom0 kernel in a 
> Ubuntu system.
> 
> 
> 
>     I have noticed an example in your wordpress @ [5]Set up Xen 3.4.3-rc2 & 
> Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse kernel) on top of Ubuntu 
> 9.10 Server
> 
> 
> 
>     With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
> 
> 
> 
>     menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
>     insmod ext2
>     set root=(hd1,10)
>     multiboot (hd1,10)/xen-3.4.gz
>     module (hd1,10)/vmlinuz-2.6.31.8
>     module (hd1,10)/initrd-2.6.31.8.img
>     }
> 
> 
> 
>     I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel option is 
> it was not important for using with grub2 right? I have not have to compile a 
> kernel with the
>     command line previous as I was just able to supply the arguments on the 
> kernel line of my menu.lst (grub configuration file).
> 
>     P.S: What is your feeling on using a recent Ubuntu system with 
> grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 
> package as well too...
> 
> 
>     -M
> 
>   
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>     Date: Sat, 27 Feb 2010 04:32:59 -0800
>     From: bderzhavets@xxxxxxxxx
>     Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN 
> kernel?
>     To: jbeulich@xxxxxxxxxx; mike.viau@xxxxxxxxxxxxxxx
>     CC: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
> 
>     You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in 
> general)
> 
>     Boris.
> 
>     --- On Fri, 2/26/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:
> 
>       From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
>       Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN 
> kernel?
>       To: bderzhavets@xxxxxxxxx, jbeulich@xxxxxxxxxx
>       Cc: xen-users@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
>       Date: Friday, February 26, 2010, 3:19 PM
> 
>       Hello again,
> 
>       Just a quick update...
> 
>       I was really hoping it was just going to be an issue with the kernel 
> .config, however I copied exact configuration from the working Debain 
> 2.6.26-2-xen-amd64 kernel
>       and used a make oldconfig but the end result was the same.
> 
>       After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via 
> both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer 
> to/from the Dom0
>       (Xen host) is ~1MB/s.
> 
>       Next I plan on re-trying my efforts on a Ubuntu system to see if same 
> network bottlenecking is present.
> 
>     
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>       Date: Fri, 26 Feb 2010 09:16:59 -0800
>       From: bderzhavets@xxxxxxxxx
>       Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN 
> kernel?
>       To: xen-users@xxxxxxxxxxxxxxxxxxx; viaum@xxxxxxxxxxxxxxx
> 
>       Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan 
> Beulich stuff.
>       He might have an answer.
>       Boris.
> 
>       --- On Fri, 2/26/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:
> 
>         From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
>         Subject: [Xen-users] How to: Improve Network Throughput of a XEN 
> kernel?
>         To: xen-users@xxxxxxxxxxxxxxxxxxx
>         Cc: waldi@xxxxxxxxxx
>         Date: Friday, February 26, 2010, 12:09 PM
> 
>         Hi there,
> 
>         I am starting a new thread to try and solve a problem I am having 
> will slow network throughput to the XEN host (not to a domU).
> 
>         I have confirmed my problem occurs with PVOPS 'xen/master' kernel as 
> well using
>         
> [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64
>  as the .config.
> 
>         It also occurs with a forward ported xenified kernel (2.6.31.12) 
> using the attached config-11-xen (.config).
> 
>         However when using the xen kernel found in debain lenny (2.6.26-2) 
> for the amd64 architecture I get similiar transfer rates to my Xen host as I 
> do on a baremetel
>         kernel.
> 
>         Bastian Blank perhaps you could point me in the right direction in 
> regards to a debian specific customization or patch I should be aware of?
>         Maxium transfer rate (to/from hard disk) using the PVOPS 'xen/master' 
> kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at 
> ~1MB/s. On the
>         debain lenny xen kernel I am getting ~4.5MB/s.
> 
>         I was hoping one could suggest options in the .config that might be 
> modified in order to improve network throughput of a XEN kernel and therefor 
> increase the data
>         transfer rates over the netowork to and from the Xen host.
> 
>         Thanks alot for any help! As always I will be willing to accept any 
> suggestions :)
> 
>         -M
> 
>     
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
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> References
> 
>    Visible links
>    1. http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
>    2. http://wiki.xensource.com/xenwiki/XenCommonProblems
>    3. 
> http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
>    4. http://wiki.xensource.com/xenwiki/XenParavirtOps
>    5. Permanent Link: Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 
> 2.6.31.8 xenified aka Suse kernel) on top of Ubuntu 9.10Server
>       
> http://bderzhavets.wordpress.com/2010/01/04/set-up-xen-3-4-3-rc1-libvirt-0-7-0-dom0-with-2-6-31-8-xenified-aka-suse-kernel-on-top-of-ubuntu-9-10-server/
>    6. 
> http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64
>    7. http://go.microsoft.com/?linkid=9708120
>    8. http://go.microsoft.com/?linkid=9708117
>    9. http://mc/compose?to=Xen-devel@xxxxxxxxxxxxxxxxxxx
>   10. http://lists.xensource.com/xen-devel
>   11. http://go.microsoft.com/?linkid=9708118
>   12. http://mc/compose?to=Xen-users@xxxxxxxxxxxxxxxxxxx
>   13. http://lists.xensource.com/xen-users
>   14. http://go.microsoft.com/?linkid=9712960

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