git: kernel - opencrypto - optimize chained synchronous callback
commit 345ee1fbc233997066e5042695d9c4a5a299803c
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri Aug 20 13:05:54 2010 -0700
kernel - opencrypto - optimize chained synchronous callbacks for soft crypto
* When a crypto operation is dispatched to a crypto thread and makes a
synchronous callback from that thread, and the callback function
dispatches a followup crypto as part of a chain, we ignore F_BATCH
and run the followup crypto directly.
Since we are already in a crypto thread there's no point dispatching
the followup crypto to another crypto thread.
Increases dm_crypt's essiv performance w/software crypto by 7%.
* Warning: The chain length for crypto operations with synchronous
callbacks should be limited to 2 or 3 to avoid blowing up the kernel's
thread stack.
Summary of changes:
sys/opencrypto/crypto.c | 27 ++++++++++++++++++++-------
sys/sys/thread.h | 1 +
2 files changed, 21 insertions(+), 7 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/345ee1fbc233997066e5042695d9c4a5a299803c
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