[Linux-ia64] IO/TLB bounce buffer space

From: Martin Wilck <Martin.Wilck_at_fujitsu-siemens.com>
Date: 2001-06-12 18:44:12

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

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?


Martin Wilck     <Martin.Wilck@fujitsu-siemens.com>
FSC EP PS DS1, Paderborn      Tel. +49 5251 8 15113
Received on Tue Jun 12 01:46:37 2001

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