[Linux-ia64] IO/TLB bounce buffer space

[Martin Wilck <Martin.Wilck@fujitsu-siemens.com>]

Hi,

it is becoming apparent that the limited bounce buffer space is the reason
for the crashes with the new aic7xxx driver and linux-IA64 with >=4GB RAM
that I reported previously.

If I understand it right,
the driver uses up to 253 buffers per device, each of which can be 8kB in
size. Consequently, it almost completely fills up the available IO/TLB
space.

Question: Would it hurt to increase IO/TLB space on machines with large
memory? Would it be possible and make sense to make IO/TLB space size a
kernel configuration option?

Regards,
Martin

-- 
Martin Wilck     <Martin.Wilck@fujitsu-siemens.com>
FSC EP PS DS1, Paderborn      Tel. +49 5251 8 15113