Messages in this thread | | | Subject | Re: [PATCH 2 of 3] memcpy32 for x86_64 | From | Bryan O'Sullivan <> | Date | Thu, 12 Jan 2006 08:04:41 -0800 |
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On Thu, 2006-01-12 at 10:38 +0200, Denis Vlasenko wrote:
> 2) On all current x86_64 hardware each 64bit access from/to > IO mapped addresses is always converted to two 32bit accesses.
This is true for 64-bit writes over Hypertransport (reads don't get split up this way), but not for PCI-Express memory writes, which remain atomic 64-bit. I'll be converting the 64-bit accesses to 32-bit, as you and Andi suggested.
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