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Slight rewording of the BUGS section.

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alex 1996-11-13 23:55:28 +00:00
parent 7523dfa587
commit 76176371e0
1 changed files with 4 additions and 4 deletions
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8
lib/libc/sys/mmap.2
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@ -213,13 +213,13 @@ was specified and insufficient memory was available.
.Sh BUGS
.Ar len
is limit to 2GB. Mmapping slightly more than 2GB doesn't work, but
mapping a window of size (filesize % 2GB) for file sizes of slightly
less than 2G, 4GB, 6GB and 8GB.
is limited to 2GB. Mmapping slightly more than 2GB doesn't work, but
it is possible to map a window of size (filesize % 2GB) for file sizes
of slightly less than 2G, 4GB, 6GB and 8GB.
The limit is imposed for a variety of reasons. Most of them have to do
with FreeBSD not wanting to use 64 bit offsets in the VM system due to
the extreme performance penalty. So FreeBSD use 32bit page indexes and
the extreme performance penalty. So FreeBSD uses 32bit page indexes and
this gives FreeBSD a maximum of 8TB filesizes. It's actually bugs in
the filesystem code that causes the limit to be further restricted to
1TB (loss of precision when doing blockno calculations).