X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=eb9c8245d4e3253bd311756cafc0708f9538ef83;hp=81217b77906a6956d1e6bd8ebd70c2986dbb6348;hb=949ae6dce35c81348cfb15f77c9d0a6785fe4053;hpb=09c782bbe1c62d016c8b165f304c7085a7ff9ffd

diff --git a/HOWTO b/HOWTO
index 81217b77..eb9c8245 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1049,7 +1049,7 @@ rate=int	Cap the bandwidth used by this job. The number is in bytes/sec,
 		will only limit writes (to 500KB/sec), the latter will only
 		limit reads.
 
-ratemin=int	Tell fio to do whatever it can to maintain at least this
+rate_min=int	Tell fio to do whatever it can to maintain at least this
 		bandwidth. Failing to meet this requirement, will cause
 		the job to exit. The same format as rate is used for
 		read vs write separation.
@@ -1064,6 +1064,15 @@ rate_iops_min=int If fio doesn't meet this rate of IO, it will cause
 		the job to exit. The same format as rate is used for read vs
 		write separation.
 
+rate_process=str	This option controls how fio manages rated IO
+		submissions. The default is 'linear', which submits IO in a
+		linear fashion with fixed delays between IOs that gets
+		adjusted based on IO completion rates. If this is set to
+		'poisson', fio will submit IO based on a more real world
+		random request flow, known as the Poisson process
+		(https://en.wikipedia.org/wiki/Poisson_process). The lambda
+		will be 10^6 / IOPS for the given workload.
+
 latency_target=int	If set, fio will attempt to find the max performance
 		point that the given workload will run at while maintaining a
 		latency below this target. The values is given in microseconds.
@@ -1081,7 +1090,7 @@ latency_percentile=float	The percentage of IOs that must fall within the
 max_latency=int	If set, fio will exit the job if it exceeds this maximum
 		latency. It will exit with an ETIME error.
 
-ratecycle=int	Average bandwidth for 'rate' and 'ratemin' over this number
+rate_cycle=int	Average bandwidth for 'rate' and 'rate_min' over this number
 		of milliseconds.
 
 cpumask=int	Set the CPU affinity of this job. The parameter given is a
@@ -1571,11 +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