From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: Increasing swiotlb default
Date: Sat, 26 Jun 2004 05:08:31 +0000 [thread overview]
Message-ID: <16605.1231.476554.213509@napali.hpl.hp.com> (raw)
In-Reply-To: <20040624212754.7dd1d68e.ak@suse.de>
>>>>> On Thu, 24 Jun 2004 21:27:54 +0200, Andi Kleen <ak@suse.de> said:
Andi> I discovered that swiotlb defaults to using only 2MB of RAM by
Andi> default. That's IMHO far too small, especially since the
Andi> consequences of overflow are so severe (panic) x86-64 has the
Andi> same problem because it shares this code.
Andi> This patch increases it to 64MB by default.
You haven't actually tested this, have you? swiotlb.c has code which
assumes that IO_TLB_SHIFT <= PAGE_SHIFT.
Also, 64MB could be a fairly significant fraction of a system's memory.
Perhaps the default value should take the amount of system memory into
account?
--david
prev parent reply other threads:[~2004-06-26 5:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-24 19:27 Increasing swiotlb default Andi Kleen
2004-06-26 5:08 ` David Mosberger [this message]
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