options: add log_compression_cpus option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index a534aa865d8c4a9384ebee3d823ecaaaf0fdfb3d..eb9c8245d4e3253bd311756cafc0708f9538ef83 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1580,11 +1580,15 @@ log_compression=int     If this is set, fio will compress the IO logs as
                in the specified log file. This feature depends on the
                availability of zlib.
 
-log_store_compressed=bool      If set, and log_compression is also set,
-               fio will store the log files in a compressed format. They
-               can be decompressed with fio, using the --inflate-log
-               command line parameter. The files will be stored with a
-               .fz suffix.
+log_compression_cpus=str       Define the set of CPUs that are allowed to
+               handle online log compression for the IO jobs. This can
+               provide better isolation between performance sensitive jobs,
+               and background compression work.
+
+log_store_compressed=bool      If set, fio will store the log files in a
+               compressed format. They can be decompressed with fio, using
+               the --inflate-log command line parameter. The files will be
+               stored with a .fz suffix.
 
 block_error_percentiles=bool   If set, record errors in trim block-sized
                units from writes and trims and output a histogram of