9p virtual file system on qemu slow
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
QEMU |
Expired
|
Undecided
|
Unassigned | ||
qemu-kvm (Ubuntu) |
Expired
|
Low
|
Unassigned |
Bug Description
Hi,
The 9p virtual file system is slow. Several examples below:
-------
Host for the first time:
$ time ls bam.unsorted/
.......
real 0m0.084s
user 0m0.000s
sys 0m0.028s
-------
Host second and following:
real 0m0.009s
user 0m0.000s
sys 0m0.008s
-------
VM for the first time:
$ time ls bam.unsorted/
.......
real 0m23.141s
user 0m0.064s
sys 0m2.156s
-------
VM for the second time
real 0m3.643s
user 0m0.024s
sys 0m0.424s
-------
Copy on host:
$ time cp 5173T.root.bak test.tmp
real 0m30.346s
user 0m0.004s
sys 0m5.324s
$ ls -lahs test.tmp
2.7G -rw------- 1 oneadmin cloud 2.7G Mar 26 21:47 test.tmp
-------
$ copy on VM for the same file
time cp 5173T.root.bak test.tmp
real 5m46.978s
user 0m0.352s
sys 1m38.962s
Changed in qemu-kvm (Ubuntu): | |
status: | New → Incomplete |
tags: | added: precise |
Changed in qemu-kvm (Ubuntu): | |
status: | Confirmed → Incomplete |
Thanks for taking the time to report this bug. Which release are you currently using? Is this performance a regression over past releases? Would it be possible for you to test with upstream qemu to see whether performance has improved?