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To: Matti Aarnio <matti.aarnio@zmailer.org>
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Subject: Re: Filesize limit on SMBFS
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From: ebiederm@xmission.com (Eric W. Biederman)
Date: 24 Nov 2001 13:43:59 -0700
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Matti Aarnio <matti.aarnio@zmailer.org> writes:

> The 2.5 series may change the underlying block-device layer so that
> it can handle larger block devices than 2TB - the 64 bit machines can
> handle them, of course, but 32-bit i386 is a bit limited...

Definitely.  Right now the page cache on x86 has a limit (per file) of
2^32 * PAGE_SIZE == 2^32 * 2^12 = 2^44 = 16TB.  And I doubt that will
change.  x86 will be going 64bit in the next 2-3 years, at which point
I don't see it paying to push 32bit code into the larger data sizes.
Especially when we our limit is still 2 orders of magnitude larger
then the largest disk manufactured today.

Now the file size limit on x86 can be increased a little by increasing
the internal PAGE_SIZE for the page cache but that will only give us a
bit or two which really isn't significant.

Eric

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