X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=aa10dbc2bccadd9dbdab852d7cc1695b8404a498;hp=aec00e84e548f1c9d65952e73803d8fcb5df53e9;hb=b2c754d12177c6ef6f9ddfaa8d52663debdb0c1f;hpb=8e827d35068326950a6781d93aeef33b66d3438b

diff --git a/HOWTO b/HOWTO
index aec00e84..aa10dbc2 100644
--- a/HOWTO
+++ b/HOWTO
@@ -158,6 +158,9 @@ specify:
 
 $ fio --name=random-writers --ioengine=libaio --iodepth=4 --rw=randwrite --bs=32k --direct=0 --size=64m --numjobs=4
 
+4.1 Environment variables
+-------------------------
+
 fio also supports environment variable expansion in job files. Any
 substring of the form "${VARNAME}" as part of an option value (in other
 words, on the right of the `='), will be expanded to the value of the
@@ -188,6 +191,20 @@ numjobs=4
 fio ships with a few example job files, you can also look there for
 inspiration.
 
+4.2 Reserved keywords
+---------------------
+
+Additionally, fio has a set of reserved keywords that will be replaced
+internally with the appropriate value. Those keywords are:
+
+$pagesize	The architecture page size of the running system
+$mb_memory	Megabytes of total memory in the system
+$ncpus		Number of online available CPUs
+
+These can be used on the command line or in the job file, and will be
+automatically substituted with the current system values when the job
+is run.
+
 
 5.0 Detailed list of parameters
 -------------------------------
@@ -794,6 +811,8 @@ verify=str	If writing to a file, fio can verify the file contents
 
 			sha256	Use sha256 as the checksum function.
 
+			sha1	Use optimized sha1 as the checksum function.
+
 			meta	Write extra information about each io
 				(timestamp, block number etc.). The block
 				number is verified.
@@ -804,7 +823,11 @@ verify=str	If writing to a file, fio can verify the file contents
 
 		This option can be used for repeated burn-in tests of a
 		system to make sure that the written data is also
-		correctly read back.
+		correctly read back. If the data direction given is
+		a read or random read, fio will assume that it should
+		verify a previously written file. If the data direction
+		includes any form of write, the verify will be of the
+		newly written data.
 
 verifysort=bool	If set, fio will sort written verify blocks when it deems
 		it faster to read them back in a sorted manner. This is