> Hi Andrew,
>
> (Please don't trim the cc.)
>
> On Fri, Jun 20, 2008 at 9:37 AM, Andrew Savchenko <Bircoph@list.ru> wrote:
> > Hello,
> >
> > On Wed, 27 Feb 2008 09:44:44 +0200 (EET), Pekka J Enberg wrote:
> >> Stephen Hemminger wrote:
> >> > > Please don't do this as a config option. Config options seem
> >> > > like a good idea to developers but are difficult for
> >> > > distributions. Either support jumbo frames by default or
> >> > > not at all.
> >>
> >> On Tue, 26 Feb 2008, Jeff Garzik wrote:
> >> > Agreed, but to be more specific... always compile in jumbo
> >> > frame support. You don't have to enable it at runtime by
> >> > default, though.
> >>
> >> Ok, so a sysfs attribute would be sufficient, I suppose? I don't
> >> have the hardware though, so I don't even know if the jumbo
> >> frame code actually works at this point hence the RFC. So I'll
> >> wait for someone to test this before sending a new patch. Thanks
> >> for the review!
> >
> > I own such card:
> > 02:02.0 Ethernet controller: Sundance Technology Inc / IC Plus Corp
> > IP1000 Family Gigabit Ethernet (rev 41)
> > and I use patch similar to yours in order to enable Jumbo Frames.
> > See attachment for details, patch is done for linux-2.6.25.6.
> >
> > It works fine for me. However, I enabled 10K jumbo boxes instead of
> > default 4K value, activated using your patch. Reason is simple: I
> > need at least 9000-byte jumbo boxes in my network.
> >
> > However, I have one request for you: please, make in possible to
> > choose max MTU via kernel config option. In different environments
> > different people may need different max MTU sizes (2K...10K).
> > Recommended value is 4K (as described in the original driver from
> > manufacturer, which was remake into kernel's one), but, for
> > example, I'm interested in larger MTU values. OTOH larger MTU
> > values require more memory and so on. For me, as for end user of
> > Linux kernel, a possibility to select desired max MTU is very
> > attractive and is definitely in no doubt more convenient than
> > patching the kernel myself each time.
> >
> > So, feel free to add jumbo boxes on ipg support to the mainstream
> > and, please, make in possible to select max MTU; 4K as default
> > will be fine.
>
> As I don't have the hardware, I would appreciate if you could test
> the following quilt tree:
>
>
http://www.kernel.org/pub/linux/kernel/people/penberg/patches/ipg/2.6.26-rc6/
>
> [Note: in case you're not familiar with quilt, the patches need to
> be applied in the order specified by the quilt 'series' file
> included there.]
>
> You can enable 10KB jumbo frames either by passing:
>
> ipg.jumbo=10k
>
> to the kernel command line or, alternatively, load the ipg module
> as follows:
>
> modprobe ipg jumbo=10k
>
> You cannot enable or disable jumbo frame support once the module
> is loaded so if you want to try out different frame sizes, you
> first need to unload the module.
>
> Pekka
