After running several days now with the deadline scheduler I can say
that the responsiveness of the system is ok now. The throughput still
needs improvement.
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@perpetualrabbit On an IO bound system high load is normally not a
problem. The processes normally wait for IO and still count for load.
Thus if the hardware is capable of performing 100 IO operations in
parallel a load of 100 is not bad even if there is only one cpu.
These are only NFS servers.
I also see that 12.04 uses cfq as I/O scheduler. 10.04 used deadline.
After switching the I/O scheduler to deadline the load quickly went down
from about 100 to 10. I have to measure whether the performance is
acceptable now.
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I see the following suspicious result:
root@d1106i06:~# ps auxwww | grep migr
root 6 0.0 0.0 0 0 ?SJun01 0:00 [migration/0]
root 8 0.0 0.0 0 0 ?SJun01 0:00 [migration/1]
root13 89.8 0.0 0 0 ?SJun01 7000
Our servers have 2x4 cores, 48 GiB RAM and 1 Gbit Ethenet each. They are
directly connected via 10 Gbit Ethernet.
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Title:
nfs4 causes enormous lo
I also see that the load goes up when it becomes really slow. I have 128
nfsd threads and 8 cores. The load is currently at 100.
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Title:
nfs4 cau
- How many clients?
About 20
- What is mounted and how?
The home directories of the users via automount. We use default mount
options but nail it to nfs 3.
- What kind of authentication (ldap, kerberos, AD, passwd/shadow,...)?
NIS
- Real nfs server or virtual?
Real
- What resources (memory
I forgot to mention that we see the probelms with NFS and NFS4. It does
not matter which version we use.
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Title:
nfs4 causes enormous load in ubu
We see a similar problem. We have a RAID < DRBD < LVM < EXT4 < NFS
configuration that worked fine with Ubuntu 10.04. After upgrading to
12.04 LTS the performance dropped significantly. The clients block
often, editing files is a pain and so on. We consider going back to
Ubuntu 10.04.
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