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[Qemu-block] [PATCH v4 1/5] qcow2: Options' documentation fixes
From: |
Leonid Bloch |
Subject: |
[Qemu-block] [PATCH v4 1/5] qcow2: Options' documentation fixes |
Date: |
Thu, 9 Aug 2018 01:11:34 +0300 |
Signed-off-by: Leonid Bloch <address@hidden>
---
docs/qcow2-cache.txt | 3 +++
qemu-options.hx | 9 ++++++---
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/docs/qcow2-cache.txt b/docs/qcow2-cache.txt
index 8a09a5cc5f..5bf2a8ad29 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.
+ - At most two of "l2-cache-size", "refcount-cache-size", and "cache-size"
+ can 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..f6804758d3 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -752,15 +752,18 @@ 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)
+(default: the sum of l2-cache-size and refcount-cache-size)
@item l2-cache-size
The maximum size of the L2 table cache in bytes
-(default: 4/5 of the total cache size)
+(default: if cache-size is not defined - 1048576 bytes or 8 clusters, whichever
+is larger; otherwise, as large as possible or needed within the cache-size,
+while permitting the requested or the minimal refcount cache size)
@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 specified, the part of
+it which is not used for the L2 cache)
@item cache-clean-interval
Clean unused entries in the L2 and refcount caches. The interval is in seconds.
--
2.17.1
- [Qemu-block] [PATCH v4 0/5] qcow2: Take the image size into account when allocating the L2 cache, Leonid Bloch, 2018/08/08
- [Qemu-block] [PATCH v4 1/5] qcow2: Options' documentation fixes,
Leonid Bloch <=
- [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Leonid Bloch, 2018/08/08
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Alberto Garcia, 2018/08/09
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Leonid Bloch, 2018/08/09
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Alberto Garcia, 2018/08/09
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Leonid Bloch, 2018/08/09
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Eric Blake, 2018/08/09
- Re: [Qemu-block] [PATCH v4 2/5] qcow2: Assign the L2 cache relatively to image size, Leonid Bloch, 2018/08/09
[Qemu-block] [PATCH v4 3/5] qcow2: Resize the cache upon image resizing, Leonid Bloch, 2018/08/08