Re: [PATCH] stmmac: reduce queue lengths if MTU is very large

This change doesn't make sense.

I disagree, but you are the boss here, so I accept that.

I'm not applying this, it just points out that the amount of reserved
space in your SWIOMMU setup might be insufficient for this situation
rather than something that should be tweaked in this driver.

Allocation of the queues is based on a parameter. If the parameter was
a size, instead of a lenght, all would be fine, wouldn't it? If you
agree, then this patch is turning the lenght into a size, in a way.

Now, how could we deal with the fact that the size explodes if the MTU
is increased?  I don't want to reserve and waste 16MB of RAM for a
single device: the device won't even use them for non-jumbo setups.  I
can use the parameter to shorten the queue in all cases, but this is
not good either.

What's your suggestion?

thanks
/alessandro