[ovs-dev] [PATCH RFC 0/1] dpif-netdev: Make EMC Size Configurable

[Pravin Shelar]

On Tue, Apr 21, 2015 at 7:30 PM, Jesse Gross <jesse at nicira.com> wrote:
> On Tue, Apr 21, 2015 at 7:23 PM, Pravin Shelar <pshelar at nicira.com> wrote:
>> On Tue, Apr 21, 2015 at 6:33 PM, Ethan Jackson <ethan at nicira.com> wrote:
>>> I really don't think this should be configurable, I can't imagine a
>>> situation in which a user would have enough knowledge to tweak the
>>> knob correctly.  I think the only reason we'd want to configure it is
>>> the current EMC size is too small at the moment.  My preference would
>>> be to figure out how to make it bigger, i.e. by doing prefetching and
>>> what not.
>>>
>>
>> It does depends on amount of memory available in system which can vary
>> alot in practice. If you have lot of memory and few devices user can
>> configure bigger EMC accordingly. Thats why it could be useful to make
>> it configurable at vswitchd startup time.
>
> Can't these be detected and data structures sized automatically? OVS
> already has a ton of configuration knobs so I agree with Ethan that it
> is not helpful to further push this onto the user who is not going to
> understand this.

I am fine with automatically configuring it at boot up. I missed that
is what Ethan was referring.