RE: [Xen-ia64-devel] [PATCH] Use16M page size in identity mappin

To:	"Tristan Gingold" <Tristan.Gingold@xxxxxxxx>, "Xu, Anthony" <anthony.xu@xxxxxxxxx>, <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-ia64-devel] [PATCH] Use16M page size in identity mapping
From:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date:	Tue, 25 Apr 2006 16:47:07 +0800
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Thread-topic:	[Xen-ia64-devel] [PATCH] Use16M page size in identity mapping

>From:Tristan Gingold
>Sent: 2006年4月25日 16:41
>
>Le Mardi 25 Avril 2006 10:25, Xu, Anthony a écrit :
>> Use 16M page size in identity mapping.
>
>Just two questions:
>
>* does itlb_miss occurs for Xen code ?  I thought it shouldn't because
>Xen
>code is TR mapped.

It occurs. At least we've known two instances: one is reported by 
Alex for part of EFI service, the other reported by Kan for FPSWA 
image. Both cases have code sections out of any TR-mapped areas 
on some type of boxes. Also from architectural reason, we should 
handle it.

>
>* Is 16MB the best size for granule ?

IA64_GRANULE_SHIFT is configurable.

Thanks,
Kevin

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RE: [Xen-ia64-devel] [PATCH] Use16M page size in identity mapping