On Thu, Aug 14, 2003, Eno Thereska wrote: > In McKusick's book "The design and Implementation of the 4.4BSD > Operating system", in the "Buffer Management subsection > of the I/O system overview, there is a a sentence that says > "...depending on available memory, a system is configured with from > 100 to 1000 buffers.." referring to the number of struct buf* in the > integrated VM/IO buffer cache. > > I have plenty of RAM in my computer, but it seems like there are always > 1000 buffers configured (empirical observation, if I try to allocate > one more after that the system freezes). How do I increase the nubmer of > buffers? More consicely, how do I allocate more memory to the buffer > management subsystem?
In FreeBSD, you get 1 buffer for every megabyte of memory up to 64 MB of RAM, and 1 buffer for every 2.5 megabytes after that. See kern_vfs_bio_buffer_alloc() in vfs_bio.c. On i386 and amd64, there's a cap of about 1000 due to KVA limits, although that cap should not be needed for amd64. _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
