Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20180604' into...

[qemu.git] / docs / throttle.txt

diff --git a/docs/throttle.txt b/docs/throttle.txt
index 28204e46cace718a339f500a3ab01814fb1bb9ee..cd4e109d393245459ca5aa0a56b8d396ed624040 100644 (file)
--- a/docs/throttle.txt
+++ b/docs/throttle.txt
@@ -10,7 +10,7 @@ Introduction
 ------------
 QEMU includes a throttling module that can be used to set limits to
 I/O operations. The code itself is generic and independent of the I/O
-units, but it is currenly used to limit the number of bytes per second
+units, but it is currently used to limit the number of bytes per second
 and operations per second (IOPS) when performing disk I/O.
 
 This document explains how to use the throttling code in QEMU, and how
@@ -39,7 +39,7 @@ the parameters for both cases:
 | throttling.bps-write  | bps_wr                |
 |-----------------------+-----------------------|
 
-It is possible to set limits for both IOPS and bps and the same time,
+It is possible to set limits for both IOPS and bps at the same time,
 and for each case we can decide whether to have separate read and
 write limits or not, but note that if iops-total is set then neither
 iops-read nor iops-write can be set. The same applies to bps-total and
@@ -235,7 +235,10 @@ consider the following values:
   - Water leaks from the bucket at a rate of 100 IOPS.
   - Water can be added to the bucket at a rate of 2000 IOPS.
   - The size of the bucket is 2000 x 60 = 120000
-  - If 'iops-total-max-length' is unset then the bucket size is 100.
+  - If 'iops-total-max-length' is unset then it defaults to 1 and the
+    size of the bucket is 2000.
+  - If 'iops-total-max' is unset then 'iops-total-max-length' must be
+    unset as well. In this case the bucket size is 100.
 
 The bucket is initially empty, therefore water can be added until it's
 full at a rate of 2000 IOPS (the burst rate). Once the bucket is full