Random write IOPS will drop dramatically if qcow2 l2 cache could not
cover the whole disk. This patch gives libvirt user a chance to adjust
the qcow2 cache configuration.
Three new qcow2 driver paramters are added. They are l2-cache-size,
refcount-cache-size and cache-clean-interval.
The following are from qcow2-cache.txt.
The amount of virtual disk that can be mapped by the L2 and refcount
caches (in bytes) is:
disk_size = l2_cache_size * cluster_size / 8
disk_size = refcount_cache_size * cluster_size * 8 / refcount_bits
The parameter "cache-clean-interval" defines an interval (in seconds).
All cache entries that haven't been accessed during that interval are
removed from memory.
Signed-off-by: Liu Qing <liuqing@xxxxxxxxxx>
---
docs/formatdomain.html.in | 21 +++++++++++
docs/schemas/domaincommon.rng | 24 +++++++++++++
src/conf/domain_conf.c | 30 ++++++++++++++++
src/qemu/qemu_command.c | 6 ++++
src/util/virstoragefile.c | 3 ++
src/util/virstoragefile.h | 4 +++
...2argv-disk-drive-qcow2-cache-clean-interval.xml | 37 +++++++++++++++++++
...qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml | 37 +++++++++++++++++++
...l2argv-disk-drive-qcow2-refcount-cache-size.xml | 37 +++++++++++++++++++
...mlout-disk-drive-qcow2-cache-clean-interval.xml | 41 ++++++++++++++++++++++
...muxml2xmlout-disk-drive-qcow2-l2-cache-size.xml | 41 ++++++++++++++++++++++
...xmlout-disk-drive-qcow2-refcount-cache-size.xml | 41 ++++++++++++++++++++++
tests/qemuxml2xmltest.c | 3 ++
13 files changed, 325 insertions(+)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.xml
create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache-clean-interval.xml
create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-l2-cache-size.xml
create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-refcount-cache-size.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 8ca7637..8f093b5 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -3035,6 +3035,27 @@
<a href="#elementsVirtio">Virtio-specific options</a> can also be
set. (<span class="since">Since 3.5.0</span>)
</li>
+ <li>
+ The optional <code>l2_cache_size</code> attribute controls how much
+ memory will be consumed by qcow2 l2 table cache. This option is
+ only valid when the driver type is qcow2. The default size is 1MB.
+ <span class='since'>Since 3.7.0</span>
+ </li>
+ <li>
+ The optional <code>refcount_cache_size</code> attribute controls
+ how much memory will be consumed by qcow2 reference count table
+ cache. This option is only valid when the driver type is qcow2.
+ The default size is 256KB.
+ <span class='since'>Since 3.7.0</span>
+ </li>
+ <li>
+ The optional <code>cache_clean_interval</code> attribute defines
+ an interval (in seconds). All cache entries that haven't been
+ accessed during that interval are removed from memory. This option
+ is only valid when the driver type is qcow2. The defaut value is 0,
+ which disables this feature.
+ <span class='since'>Since 3.7.0</span>
+ </li>
</ul>
</dd>
<dt><code>backenddomain</code></dt>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 06c5a91..5545179 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -1797,6 +1797,15 @@
<ref name="driverIOThread"/>
</optional>
<optional>
+ <ref name="qcow2_l2_cache_size"/>
+ </optional>
+ <optional>
+ <ref name="qcow2_refcount_cache_size"/>
+ </optional>
+ <optional>
+ <ref name="qcow2_cache_clean_interval"/>
+ </optional>
+ <optional>
<ref name="detect_zeroes"/>
</optional>
<ref name="virtioOptions"/>
@@ -1895,6 +1904,21 @@
</choice>
</attribute>
</define>
+ <define name="qcow2_l2_cache_size">
+ <attribute name='l2_cache_size'>
+ <ref name="unsignedInt"/>
+ </attribute>
+ </define>
+ <define name="qcow2_refcount_cache_size">
+ <attribute name='refcount_cache_size'>
+ <ref name="unsignedInt"/>
+ </attribute>
+ </define>
+ <define name="qcow2_cache_clean_interval">
+ <attribute name='cache_clean_interval'>
+ <ref name="unsignedInt"/>
+ </attribute>
+ </define>
<define name="controller">
<element name="controller">
<optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index f7574d7..f07ab72 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -8600,6 +8600,30 @@ virDomainDiskDefDriverParseXML(virDomainDiskDefPtr def,
VIR_FREE(tmp);
}
+ if ((tmp = virXMLPropString(cur, "l2_cache_size")) &&
+ (virStrToLong_ui(tmp, NULL, 10, &def->src->l2_cache_size) < 0)) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("Invalid l2_cache_size attribute in disk driver element: %s"),
+ tmp);
+ goto cleanup;
+ }
+
+ if ((tmp = virXMLPropString(cur, "refcount_cache_size")) &&
+ (virStrToLong_ui(tmp, NULL, 10, &def->src->refcount_cache_size) < 0)) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("Invalid refcount_cache_size attribute in disk driver element: %s"),
+ tmp);
+ goto cleanup;
+ }
+
+ if ((tmp = virXMLPropString(cur, "cache_clean_interval")) &&
+ (virStrToLong_ui(tmp, NULL, 10, &def->src->cache_clean_interval) < 0)) {
+ virReportError(VIR_ERR_XML_ERROR,
+ _("Invalid cache_clean_interval attribute in disk driver element: %s"),
+ tmp);
+ goto cleanup;
+ }
+
if ((tmp = virXMLPropString(cur, "detect_zeroes")) &&
(def->detect_zeroes = virDomainDiskDetectZeroesTypeFromString(tmp)) <= 0) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@@ -21897,6 +21921,12 @@ virDomainDiskDefFormat(virBufferPtr buf,
virBufferAsprintf(&driverBuf, " iothread='%u'", def->iothread);
if (def->detect_zeroes)
virBufferAsprintf(&driverBuf, " detect_zeroes='%s'", detect_zeroes);
+ if (def->src->l2_cache_size > 0)
+ virBufferAsprintf(&driverBuf, " l2_cache_size='%u'", def->src->l2_cache_size);
+ if (def->src->refcount_cache_size > 0)
+ virBufferAsprintf(&driverBuf, " refcount_cache_size='%u'", def->src->refcount_cache_size);
+ if (def->src->cache_clean_interval > 0)
+ virBufferAsprintf(&driverBuf, " cache_clean_interval='%u'", def->src->cache_clean_interval);
virDomainVirtioOptionsFormat(&driverBuf, def->virtio);
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 9a27987..7996eed 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1430,6 +1430,12 @@ qemuBuildDriveSourceStr(virDomainDiskDefPtr disk,
qemuformat = "luks";
virBufferAsprintf(buf, "format=%s,", qemuformat);
}
+ if (disk->src->format == VIR_STORAGE_FILE_QCOW2 && disk->src->l2_cache_size > 0)
+ virBufferAsprintf(buf, "l2-cache-size=%u,", disk->src->l2_cache_size);
+ if (disk->src->format == VIR_STORAGE_FILE_QCOW2 && disk->src->refcount_cache_size > 0)
+ virBufferAsprintf(buf, "refcount-cache-size=%u,", disk->src->refcount_cache_size);
+ if (disk->src->format == VIR_STORAGE_FILE_QCOW2 && disk->src->cache_clean_interval > 0)
+ virBufferAsprintf(buf, "cache-clean-interval=%u,", disk->src->cache_clean_interval);
ret = 0;
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index fbc8245..c685331 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -2038,6 +2038,9 @@ virStorageSourceCopy(const virStorageSource *src,
ret->physical = src->physical;
ret->readonly = src->readonly;
ret->shared = src->shared;
+ ret->l2_cache_size = src->l2_cache_size;
+ ret->refcount_cache_size = src->refcount_cache_size;
+ ret->cache_clean_interval = src->cache_clean_interval;
/* storage driver metadata are not copied */
ret->drv = NULL;
diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index 6c388b1..e7889d9 100644
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -280,6 +280,10 @@ struct _virStorageSource {
/* metadata that allows identifying given storage source */
char *nodeformat; /* name of the format handler object */
char *nodestorage; /* name of the storage object */
+
+ unsigned l2_cache_size; /* qcow2 l2 cache size */
+ unsigned refcount_cache_size; /* qcow2 reference count table cache size */
+ unsigned cache_clean_interval; /* clean unused cache entries interval */
};
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.xml
new file mode 100644
index 0000000..1c3174d
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-cache-clean-interval.xml
@@ -0,0 +1,37 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' cache_clean_interval='900'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml
new file mode 100644
index 0000000..ebe4c3c
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-l2-cache-size.xml
@@ -0,0 +1,37 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' l2_cache_size='2097152'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.xml
new file mode 100644
index 0000000..e8835e2
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-qcow2-refcount-cache-size.xml
@@ -0,0 +1,37 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' refcount_cache_size='524288'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'/>
+ <controller type='ide' index='0'/>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache-clean-interval.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache-clean-interval.xml
new file mode 100644
index 0000000..6c1934f
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-cache-clean-interval.xml
@@ -0,0 +1,41 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' cache_clean_interval='900'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-l2-cache-size.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-l2-cache-size.xml
new file mode 100644
index 0000000..4da0e4d
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-l2-cache-size.xml
@@ -0,0 +1,41 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' l2_cache_size='2097152'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-refcount-cache-size.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-refcount-cache-size.xml
new file mode 100644
index 0000000..bda4574
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-disk-drive-qcow2-refcount-cache-size.xml
@@ -0,0 +1,41 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='qcow2' cache='none' refcount_cache_size='524288'/>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <disk type='block' device='cdrom'>
+ <driver name='qemu' type='raw'/>
+ <source dev='/dev/HostVG/QEMUGuest2'/>
+ <target dev='hdc' bus='ide'/>
+ <readonly/>
+ <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+ </disk>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='ide' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='none'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 311b713..a1af6e5 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -461,6 +461,9 @@ mymain(void)
DO_TEST("disk-drive-cache-v2-none", NONE);
DO_TEST("disk-drive-cache-directsync", NONE);
DO_TEST("disk-drive-cache-unsafe", NONE);
+ DO_TEST("disk-drive-qcow2-l2-cache-size", NONE);
+ DO_TEST("disk-drive-qcow2-refcount-cache-size", NONE);
+ DO_TEST("disk-drive-qcow2-cache-clean-interval", NONE);
DO_TEST("disk-drive-network-nbd", NONE);
DO_TEST("disk-drive-network-nbd-export", NONE);
DO_TEST("disk-drive-network-nbd-ipv6", NONE);
--
1.8.3.1
--
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