Server product kernel requirements

[Josh Boyer]

On Fri, Nov 1, 2013 at 8:12 AM, Prarit Bhargava <prarit at redhat.com> wrote:
> On 10/31/2013 03:05 PM, Prarit Bhargava wrote:
>>
>>
>> On 10/31/2013 03:02 PM, Josh Boyer wrote:
>>> On Thu, Oct 31, 2013 at 2:33 PM, Bill Nottingham <notting at redhat.com> wrote:
>>>> Josh Boyer (jwboyer at fedoraproject.org) said:
>>>>> (As for memory-critical cloud... I have no idea what that is to be
>>>>> honest.  All I hear from the cloud people is "smaller is better".
>>>>> Mostly that's image size, not memory overhead but I can imagine they
>>>>> want that limited as well.)
>>>>
>>>> Admittedly, it's not the same as unswappable kernel memory, but I wonder if
>>>> for 2MB we can find that sort of working set size reductions in other places
>>>> on the cloud image.
>>>
>>> Quite possibly so.  I just hate to be wasteful if none of the 3
>>> products clearly has a need.  If 1024 is sufficient, we'll likely go
>>> with that.
>>>
>>
>> The reason I'm pushing 1024 as a target is that we had a previous request from
>> users at SGI for a 1024.  At least that is something we can point to instead of
>> picking a value that no one really wants.
>>
>> IMO of course ;)
>>
>
> Memory usage data
>
> difference between 1024 cpus and 128 cpus = 421k

OK.  I'll change this in rawhide today.

> difference between 4096 cpus and 128 cpus = 1.9M

I am now amazed that my memory actually had this right.  That's rare.

Anyway, thanks much for getting these numbers.  They really help.

josh