Re: [Xen-devel] [PATCH RFC V6 0/11] Paravirtualized ticketlocks

[Alan Meadows <alan.meadows@xxxxxxxxx>]

I am happy to see this issue receiving some attention and second the wish to see these patches be considered for further review and inclusion in an upcoming release.

Overcommit is not as common in enterprise and single-tenant virtualized environments as it is in multi-tenant environments, and frankly we have been suffering.

We have been running an early copy of these patches in our lab and in a small production node sample set both on 3.2.0-rc4 and 3.3.0-rc6 for over two weeks now with great success. With the heavy level of vCPU:pCPU overcommit required for our situation, the patches are increasing performance by an _order of magnitude_ on our E5645 and E5620 systems. 

Alan Meadows

On Tue, Mar 27, 2012 at 12:37 AM, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx> wrote:

On 03/26/2012 07:55 PM, Avi Kivity wrote:

On 03/21/2012 12:20 PM, Raghavendra K T wrote:

From: Jeremy Fitzhardinge<jeremy.fitzhardinge@xxxxxxxxxx>

[...]

This series provides a Xen implementation, but it should be
straightforward to add a KVM implementation as well.

Looks like a good baseline on which to build the KVM implementation.  We
might need some handshake to prevent interference on the host side with
the PLE code.

Avi, Thanks for reviewing. True, it is sort of equivalent to PLE on non PLE machine.

Ingo, Peter,
Can you please let us know if this series can be considered for next merge window?
OR do you still have some concerns that needs addressing.

I shall rebase patches to 3.3 and resend. (main difference would be UNINLINE_SPIN_UNLOCK and jump label changes to use static_key_true/false() usage instead of static_branch.)

Thanks,
Raghu

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