[ofa-general] Re: [PATCH 0/3] ib/ipoib: Enable IPoIB-UD 4K MTU support

Shirley Ma xma at us.ibm.com
Sat Feb 2 08:16:51 PST 2008






Hello Roland,

> So how about the following?  When using a UD MTU of 4096 with a page
> size of 4096, allocate an skb of size 44 for the GRH and ethertype,
> and then allocate a single page for the fragment list.  This means
> that the IP packet will start nicely 16-byte aligned for free, and all
> the bookkeeping is very simple.

My patch has been passed the stress test for both PPC and Intel
architechture against OFED-1.3-RC2 bit for a couple days. And I didn't see
performance imapct for 2K mtu. But I rethink about your suggestion here
yesterday night. I can modify my patch to meet your thoughts here by
keeping current implementation of 2K mtu and using if condition check for
the new code. I will submit a new version of patchset today for review.
Since I only have two days for my patch to be integred into OFED-1.3-RC3
for Distros to pick up. I would like to see your ack here for this approach
as soon as possible. I will compare two different implementation's
performance.

Thanks for your inputs. Appreciate your prompt response.

Thanks
Shirley
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openfabrics.org/pipermail/general/attachments/20080202/3969ea77/attachment.html>


More information about the general mailing list