From 6edf7a89260859c5e72861dc4e6e169495f076c8 Mon Sep 17 00:00:00 2001 From: Dmitry Kasatkin Date: Tue, 6 May 2014 14:47:13 +0300 Subject: ima: introduce multi-page collect buffers Use of multiple-page collect buffers reduces: 1) the number of block IO requests 2) the number of asynchronous hash update requests Second is important for HW accelerated hashing, because significant amount of time is spent for preparation of hash update operation, which includes configuring acceleration HW, DMA engine, etc... Thus, HW accelerators are more efficient when working on large chunks of data. This patch introduces usage of multi-page collect buffers. Buffer size can be specified using 'ahash_bufsize' module parameter. Default buffer size is 4096 bytes. Changes in v3: - kernel parameter replaced with module parameter Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar --- Documentation/kernel-parameters.txt | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'Documentation/kernel-parameters.txt') diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 775fe039e060..8b2ab548b6e4 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1322,6 +1322,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. different crypto accelerators. This option can be used to achieve the best performance for a particular HW. + ima.ahash_bufsize= [IMA] Asynchronous hash buffer size + Format: + Set hashing buffer size. Default: 4k. + + ahash performance varies for different chunk sizes on + different crypto accelerators. This option can be used + to achieve best performance for particular HW. + init= [KNL] Format: Run specified binary instead of /sbin/init as init -- cgit