lkml.org 
[lkml]   [2012]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Parallelize mtrr init between cpus
On 08/07/2012 07:08 PM, zhenzhong.duan wrote:
>
>
> 2012-08-08 00:32, H. Peter Anvin wrote:
>> On 08/07/2012 12:29 AM, zhenzhong.duan wrote:
>>> Current code serialize mtrr init with set_atomicity_lock.
>>> Mtrr init is quite slow when we bootup on a hvm with large mem, vcpus
>>> and pci passthroughed devices(eg. 24 vcpus + 90G mem).
>>> It took about ~30 mins to bootup, after patch, it took ~2 min.
>> When you're saying "HVM" do you mean "Xen HVM"? How does it behave on
>> native hardware?
>>
>> -hpa
> Yes, I mean Xen HVM. Bootup at same speed as before on baremetal.

Then I would like to know why Xen HVM takes so infernally long. It
isn't a good idea to make gratuitous changes in the main kernel to work
around defects in Xen.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



\
 
 \ /
  Last update: 2012-08-08 06:22    [W:0.066 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site