Signed-off-by: Leonid Bloch <lbl...@janustech.com>
---
docs/qcow2-cache.txt | 3 +++
qemu-options.hx | 15 +++++++++++----
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/docs/qcow2-cache.txt b/docs/qcow2-cache.txt
index 8a09a5cc5f..9d261b7da9 100644
--- a/docs/qcow2-cache.txt
+++ b/docs/qcow2-cache.txt
@@ -130,6 +130,9 @@ There are a few things that need to be taken into account:
memory as possible to the L2 cache before increasing the refcount
cache size.
+- All three "l2-cache-size", "refcount-cache-size", and "cache-size" options
+ can not be set simultaneously.
+
Unlike L2 tables, refcount blocks are not used during normal I/O but
only during allocations and internal snapshots. In most cases they are
accessed sequentially (even during random guest I/O) so increasing the
diff --git a/qemu-options.hx b/qemu-options.hx
index b1bf0f485f..ef0706c359 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -752,15 +752,22 @@ image file)
@item cache-size
The maximum total size of the L2 table and refcount block caches in bytes
-(default: 1048576 bytes or 8 clusters, whichever is larger)
@item l2-cache-size
-The maximum size of the L2 table cache in bytes
-(default: 4/5 of the total cache size)
+The maximum size of the L2 table cache.
+(default: if cache-size is not defined - 1048576 bytes or 8 clusters,
+whichever is larger; if cache-size is defined and is large enough to
+accommodate enough L2 cache to cover the entire virtual size of the image plus
+the minimal amount of refcount cache - enough to cover the entire image;
+if cache-size is defined and is not large enough - as much as possible while
+leaving space for the needed refcount cache)
@item refcount-cache-size
The maximum size of the refcount block cache in bytes
-(default: 1/5 of the total cache size)
+(default: 4 times the cluster size, or if cache-size is defined and is large
+enough to accommodate enough L2 cache to cover the entire virtual size of the
+image plus the minimal amount of refcount cache - the part of cache-size which
+is left after allocating the full L2 cache)
@item cache-clean-interval
Clean unused entries in the L2 and refcount caches. The interval is in seconds.
--
2.14.1
