Re: TMEM + pv_ops kernel?

[Rick Boone <rick@buzz-media.com>]

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Hey Dan,

I'm currently working with the xen/stable-2.6.32.x branch (2.6.32.12 in 
particular), from Jeremy's repo. I figured we would try to standardize 
around that, since the xen wiki says it's gonna be the branch thats 
maintained long term.

-- Rick

On 05/14/2010 03:59 PM, Dan Magenheimer wrote:
>
> Hi Rick –
>
>
> Which exact pv_ops tree do you expect to use?  The Linux patch is 
> slightly different on each Linux version and I don’t know if/how 
> patches such as tmem will get transferred across Jeremy’s and Konrad’s 
> different pv_ops trees.
>
>
> Dan
>
> *From:* Rick Boone [mailto:rick@buzz-media.com]
> *Sent:* Friday, May 14, 2010 4:38 PM
> *To:* xen-devel@lists.xensource.com
> *Subject:* Re: [Xen-devel] TMEM + pv_ops kernel?
>
> Hey Dan,
>
> Yeah, I'm planning on using pv_ops for both the dom0 and domU kernels.
>
> Any movement towards making TMEM available would be great; it's one of 
> the key things we're looking forward to testing and using (along with 
> Remus)
>
> I'm systems engineer at a company running about 50 blogs/social 
> networking websites (http://buzz-media.com) , all on top of a heavily 
> virtualized infrastructure (Xen [v3.2] is our sole virt platform) . 
> We've got about 80 dom0's, holding about 125 domU's and on a few of 
> those boxes, especially those holding one or more of our web server 
> domU's, we run into "out of memory" crashes from time to time. So, 
> we're hoping to see if TMEM helps reduce our memory woes. We tend to 
> mix and match types of domU's within dom0's, so some boxes will have 1 
> memory-hungry web server, alongside a number of smaller, low-usage, 
> low-memory, developer boxes. From what we've read, TMEM might be 
> perfect for our setup.
>
> -- Rick
>
>
> On 05/14/2010 08:26 AM, Dan Magenheimer wrote:
>
> Hi Rick –
>
> Tmem is primarily of use in PV guests, less so in dom0.  Are you 
> putting pv_ops kernels in your PV guests (domUs)?
>
> If so, Jeremy has been a big proponent of tmem and we can work 
> together to get it into his pv_ops tree.   But I think most of the 
> focus for the pv_ops work has been to provide dom0 support.  Upstream 
> kernels already provide domU support, so I’ve been instead working on 
> the linux-kernel-mailing-list toward getting tmem patches accepted 
> upstream.
>
> If not, just using a tmem-modified dom0 will probably not help you.  
>  I have been working on tmem-modified rpm’s for various RedHat-ish 
> kernels and I know Jan Beulich has been working on putting tmem 
> support into various SuSE kernels.
>
> I’d also be interested in more information about your planned usage 
> model for tmem.
>
> Thanks,
>
> Dan
>
> *From:* Rick Boone [mailto:rick@buzz-media.com]
> *Sent:* Thursday, May 13, 2010 4:17 PM
> *To:* xen-devel@lists.xensource.com <mailto:xen-devel@lists.xensource.com>
> *Subject:* [Xen-devel] TMEM + pv_ops kernel?
>
> Hey,
>
> I'm building Jeremy's pv_ops dom0 kernel (2.6.32.12) for use with Xen 
> 4.0 and it looks like the Transcendant Memory options arent in the 
> kernel config. Is TMEM not available in pv_ops? I've been looking 
> forward to using it with Xen4, but also really wanna work with pv_ops 
> moving forward.
>
> Thanks alot,
> -- Rick
>

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