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Re: In-order exection of I/O on PowerPC 60x
- From: Andrew Lunn <andrew at lunn dot ch>
- To: Peter Graf <p dot graf at itknet dot de>
- Cc: ecos-discuss at sourceware dot org
- Date: Thu, 23 Mar 2006 13:39:33 +0100
- Subject: Re: [ECOS] In-order exection of I/O on PowerPC 60x
- References: <44228DFD.8030309@itknet.de>
> When I placed a sync instruction between the critical read accesses,
> instead of eieio, our problems disappeared. (The sync instruction covers
> reads even if memory is not marked as "guarded".)
What is the overhead of a sync compaired to an eieio? Should we just
change the barrier macro?
Andrew
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