Bug 1165580
| Summary: | blkiotune value should be consistent with value in cgroup | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Pei Zhang <pzhang> |
| Component: | libvirt | Assignee: | Martin Kletzander <mkletzan> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.1 | CC: | dyuan, mkletzan, mzhan, rbalakri, xuzhang |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-1.2.17-7.el7 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-11-19 05:56:25 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Patch proposed upstream: https://www.redhat.com/archives/libvir-list/2015-August/msg00065.html Verified version:
libvirt-1.2.17-8.el7.x86_64
qemu-kvm-rhev-2.3.0-22.el7.x86_64
verified steps:
1.define and start a guest, check blkiotune value.
# virsh blkiotune r72
weight : 1000
device_weight :
device_read_iops_sec:
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec:
1.1. set a iops value that kernel accepts, but does not set them.
set the value
# virsh blkiotune r72 --device-read-iops-sec /dev/sdb,4294967295
get the value via blkiotune
# virsh blkiotune r72
weight : 1000
device_weight :
device_read_iops_sec:
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec:
check in cgroup, Nothing ouput
# cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr72.scope/blkio.throttle.read_iops_device
check domian xml, Nothing output.
# virsh dumpxml r72 | grep blkiotune -A 3
1.2 set a normal value that kernel accpets and will set them in cgroup.
# virsh blkiotune r72 --device-read-iops-sec /dev/sdb,4294967294
check in cgroup
# cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr72.scope/blkio.throttle.read_iops_device
8:16 4294967294
check via blkiotune
# virsh blkiotune r72
weight : 1000
device_weight :
device_read_iops_sec: /dev/sdb,4294967294
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec:
check in domian xml :
# virsh dumpxml r72 | grep blkiotune -A 3
<blkiotune>
<device>
<path>/dev/sdb</path>
<read_iops_sec>4294967294</read_iops_sec>
--
</blkiotune>
2. set a bps value that kernel accepts, but does not set them.
# virsh blkiotune r72 --device-write-bytes-sec /dev/sdb,18446744073709551615
get the value via blkiotune
# virsh blkiotune r72
weight : 1000
device_weight :
device_read_iops_sec:
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec:
check in cgroup, Nothing ouput
# cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr72.scope/blkio.throttle.write_bps_device
check domian xml, Nothing output.
# virsh dumpxml r72 | grep blkiotune -A 3
2.1 set a normal value that kernel accpets and will set them in cgroup.
# virsh blkiotune r72 --device-write-bytes-sec /dev/sdb,18446744073709551614
check in cgroup
# cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr72.scope/blkio.throttle.write_bps_device
8:16 18446744073709551614
check via blkiotune
# virsh blkiotune r72
weight : 1000
device_weight :
device_read_iops_sec:
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec: /dev/sdb,18446744073709551614
check in domain xml
# virsh dumpxml r72 | grep blkiotune -A 5
<blkiotune>
<device>
<path>/dev/sdb</path>
<write_bytes_sec>18446744073709551614</write_bytes_sec>
</device>
</blkiotune>
Also tested with lxc using same steps as above.
Now the values set via blkiotune are in sync with cgroup.
Move to verified.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-2202.html |
Description of problem: a maximum value can be set by blkiotune , but can not be checked in cgroup. Version-Release number of selected component (if applicable): kernel-3.10.0-203.el7.x86_64 qemu-kvm-rhev-2.1.2-8.el7.x86_64 libvirt-1.2.8-6.el7.x86_64 How reproducible: 100% Steps to Reproduce: # virsh list Id Name State ---------------------------------------------------- 29 r7 running 1> for device_read/write_iops_sec , set value=4294967295 , set successfully. but can not be checked in cgroup. 1.1> set the value and check using blkiotune command # virsh blkiotune r7 --device-read-iops-sec /dev/sda,4294967295 --device-write-iops-sec /dev/sda,4294967295 [root@184 ~]# virsh blkiotune r7 weight : 500 device_weight : device_read_iops_sec: /dev/sda,4294967295 device_write_iops_sec: /dev/sda,4294967295 device_read_bytes_sec: device_write_bytes_sec: 1.2> check the value in the cgroup , it has nothing # cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr7.scope/blkio.throttle.read_iops_device # cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr7.scope/blkio.throttle.write_iops_device 2> for device_read/write_bytes_sec , set value= 18446744073709551615, set successfully. but can not be checked in cgroup. 2.1> set the value and check using blkiotune command # virsh blkiotune r7 --device-read-bytes-sec /dev/sda,18446744073709551615 --device-write-bytes-sec /dev/sda,18446744073709551615 # virsh blkiotune r7 weight : 500 device_weight : device_read_iops_sec: /dev/sda,4294967295 device_write_iops_sec: /dev/sda,4294967295 device_read_bytes_sec: /dev/sda,18446744073709551615 device_write_bytes_sec: /dev/sda,18446744073709551615 2.2> check the value in cgroup , it has nothing # cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr7.scope/blkio.throttle.read_bps_device # cat /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2dr7.scope/blkio.throttle.write_bps_device 3>check domain XML , it has the value . # virsh dumpxml r7 | grep blkiotune -A 8 <blkiotune> <device> <path>/dev/sda</path> <read_iops_sec>4294967295</read_iops_sec> <write_iops_sec>4294967295</write_iops_sec> <read_bytes_sec>18446744073709551615</read_bytes_sec> <write_bytes_sec>18446744073709551615</write_bytes_sec> </device> </blkiotune> Actual results: As above , the value can be set by blkiotune and set successfully in the domain XML , but it has nothing in cgroup. Expected results: the value set by blkiotune can be checked in cgroup. Additional info: