[vbox-dev] [PATCH] performance improvements for Solaris guest shared folders

Ramshankar ramshankar.venkataraman at oracle.com
Wed Nov 9 13:05:50 GMT 2011

Thought I'd give a status update.

I've integrated the following patches (with some minor 
changes/additions) after testing them out a bit.


I'm giving more priority to the patches that address bugs. Patches that 
improve performance will also be integrated but after the bug-fix ones 
are done.

Thanks & Regards,

On 11/ 6/11 07:45 AM, Life is hard, and then you die wrote:
> On Sat, Nov 05, 2011 at 04:29:32AM -0700, Life is hard, and then you die wrote:
>> On Tue, Jan 18, 2011 at 10:45:16AM +0100, Frank Mehnert wrote:
>>> On Sunday 16 January 2011 11:50:06 Life is hard, and then you die wrote:
>>>> Attached are some patches to improve the performance of shared-folders
>>>> in Solaris guests. Together they speed up things between 2 to 4 times:
>>>> operations like untarring and deleting whole directory tree are
>>>> typically 2 to 2.5 times faster, and when running builds that include
>>>> things like building Solaris packages I see a speedup of 3 to almost 4.
>>>> The bulk of the speedup comes from the second (file open) patch.
>>>> These patches assume my previously sent patches have been applied.
>>>> Licensed under MIT/public-domain.
>>> Thank you very much for this code contribution! We will revise it a bit
>>> later as our colleague which maintains this code is currently not
>>> available.
>> I don't want to appear pushy, but since I've seen that some work has
>> been done in recent weeks on the Solaris shared-folders code, I'm
>> wondering if you might have time to review the patches. I rebased them
>> onto svn rev 39192 (and updated to VB 4.1.6) and they appear to still
>> work fine on Solaris 10u8 (after disabling the mmap support - see
>> https://www.virtualbox.org/ticket/9856).
>> For your convenience I've attached the rebased patches (in the order
>> they should be applied), though all in one email instead of spread
>> over 4 separate emails like last Jan.
> Argh! I just realized that the symlink deletion issue was fixed a
> while ago, so the hack in vbox.symlink.patch is not necessary anymore
> (yay!). Since updating this patch causes some subsequent patches to
> not apply cleanly anymore, I'm just re-sending the full list of
> patches (i.e. please ignore those I sent yesterday).
>    Cheers,
>    Ronald
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