Alan Cox e340fc602b Request a CPU private mapping from sf_buf_alloc(). If the swap-backed ...

memory disk is larger than the number of available sf_bufs, this improves
performance on SMPs by eliminating interprocessor TLB shootdowns.  For
example, with 6656 sf_bufs, the default on my test machine, and a 256MB
swap-backed memory disk, I see the command
"dd if=/dev/md0 of=/dev/null bs=64k" achieve ~489MB/sec with the default,
shared mappings, and ~587MB/sec with CPU private mappings.

2005-02-13 21:51:50 +00:00

..

md.c

Request a CPU private mapping from sf_buf_alloc(). If the swap-backed

2005-02-13 21:51:50 +00:00