Bad Performance CPU? get-cpufreq-para failed
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@olivierlambert
Ok no proplem.Servertype: HP ProLiant DL380p Gen8
CPU 2 x Xeon(R) CPU E5-2680 0 @ 2.70GHzRAM 128GB DDR3 1333Mhz ECC RAM
Storage 8x 900GB SAS 10K Disks at P420i Raid Controller
Configured as:
1x 1,8 TB RAID 1+0 (4 Disks)
1x 1,8 TB RAID 1+0 (4 Disks)[11:55 localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda3 VG_XenStorage-76d8320a-18bd-1b29-4040-caf0361ce575 lvm2 a-- <1.60t 777.70g /dev/sdb VG_XenStorage-76d8320a-18bd-1b29-4040-caf0361ce575 lvm2 a-- <1.64t <1.64tNIC 1xHP Ethernet 1Gb 4-port 331FLR Adapter (4x1Gbit/s)
- Nic0 = Management
- Nic1 + Nic2 = Bond for VM
- Nic3 = Storage Network for Backup
Actual active VMs 1x Win10 4x vCPU 8GB RAM
1x Win10 4x vCPU 8GB RAM
1x Win10 4x vCPU 16GB RAM
1x Win10 4x vCPU 8GB RAM (temporary fresh installed for testing)
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@Affonso thanks for this...
doese the cpu boost the frequency on load or is the cpu permanetly on 2,7ghz
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What's the load average on your Dom0? What's the current resources allocated to it? (vCPUs and memory)? Might be interesting to check also the load on the SR (eg with
iostat -x) -
@high-voltages I believe turbo boost takes it up to 3.3GHz. The 2.7 is reduced workload
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In guests (even privileded guest like dom0),
/proc/cpuinforeports only what xen exposes to it, it generally is shown as fixed value.You can only get some more insight using
xenpmwhen it actually shows something. I found it commonly having parts working or not depending on the CPU. On a xeon here, I get the same as you withget-cpufreq-parabut you can have a look atget-cpufreq-averagewhich is generally working, here you can see the frequency moving, on an idle machine it should be lower, and get higher with load.Hope this helps.
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Thanks for the Feedback @ all
I have tested some commands from above and discovered something
a good working host system:
iostat -x Linux 4.19.0+1 (xcpngautewe) 02/27/2024 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.18 0.00 0.34 0.00 0.07 99.41 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util nvme0n1 0.04 0.08 2.02 2.50 135.07 202.56 149.24 0.00 0.30 0.27 0.32 0.21 0.10 sda 0.08 0.81 2.29 3.26 126.80 161.85 104.05 0.00 0.57 0.69 0.48 0.29 0.16 dm-0 0.00 0.00 0.00 0.00 0.47 0.00 244.40 0.00 0.81 0.82 0.00 0.81 0.00 dm-1 0.00 0.00 0.00 0.00 0.33 0.00 215.58 0.00 0.86 0.91 0.04 0.86 0.00 dm-2 0.00 0.00 0.00 0.00 0.00 0.00 21.18 0.00 0.19 0.16 0.23 0.19 0.00 dm-3 0.00 0.00 0.21 0.21 12.58 11.83 117.71 0.00 0.71 0.97 0.46 0.33 0.01 tda 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 0.55 0.55 0.00 0.15 0.00 tdb 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 0.55 0.55 0.00 0.15 0.00in comparison to the slow host system:
iostat -x Linux 4.19.0+1 (localhost.localdomain) 02/27/2024 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.29 0.00 0.53 0.02 0.03 99.13 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 0.14 0.91 6.54 7.67 308.70 284.24 83.43 0.10 7.15 3.08 10.62 2.96 4.21 sdb 0.00 0.00 0.01 0.00 1.33 0.00 254.01 0.00 1.61 1.61 7.25 1.60 0.00 dm-0 0.00 0.00 0.00 0.00 0.54 0.00 253.31 0.00 1.78 1.73 34.50 1.76 0.00 dm-5 0.00 0.00 0.20 0.17 20.11 2.27 119.98 0.00 4.71 0.91 9.28 2.41 0.09 tdc 0.00 0.00 0.00 0.00 0.04 0.00 81.29 0.00 27.58 27.58 0.00 7.40 0.00 sdc 0.00 0.00 0.01 0.00 0.53 0.00 126.86 0.00 4.08 4.08 0.00 2.24 0.00 dm-1 0.00 0.00 1.26 1.76 49.67 39.38 59.01 0.02 5.22 2.67 7.05 4.00 1.21 dm-2 0.00 0.00 0.12 0.14 21.73 24.61 345.21 0.00 9.35 4.45 13.56 3.18 0.09 dm-3 0.00 0.00 0.11 0.00 2.20 0.00 41.97 0.00 0.97 0.97 0.00 0.84 0.01 dm-4 0.00 0.00 0.27 0.00 12.30 0.00 90.10 0.00 3.15 3.15 0.00 2.56 0.07 tda 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 2.42 2.42 0.00 1.28 0.00 tdb 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 0.60 0.60 0.00 0.23 0.00 dm-6 0.00 0.00 0.11 0.10 5.00 4.04 87.11 0.00 6.31 2.74 10.09 3.63 0.08 tdd 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 0.53 0.53 0.00 0.38 0.00 dm-7 0.00 0.00 0.04 0.00 1.96 0.04 88.39 0.00 4.69 4.02 15.47 3.11 0.01 tde 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 0.57 0.57 0.00 0.38 0.00 dm-8 0.00 0.00 0.00 0.00 0.00 0.00 45.15 0.00 11.98 7.87 20.20 10.80 0.00 dm-9 0.00 0.00 0.00 0.00 0.00 0.00 38.85 0.00 12.60 6.04 23.95 11.96 0.00 dm-10 0.00 0.00 0.07 0.04 1.97 1.26 58.93 0.00 10.88 7.96 15.34 2.78 0.03 dm-11 0.00 0.00 0.00 0.00 0.00 0.00 28.84 0.00 12.16 12.16 0.00 7.12 0.00 dm-12 0.00 0.00 0.00 0.00 0.00 0.00 41.06 0.00 10.25 10.25 0.00 6.90 0.00 dm-13 0.00 0.00 0.00 0.00 0.00 0.00 54.52 0.00 5.10 5.10 0.00 5.02 0.00 dm-14 0.00 0.00 0.04 0.00 1.36 0.00 67.46 0.00 4.38 4.38 0.00 2.27 0.01 dm-15 0.00 0.00 0.01 0.00 0.12 0.00 48.19 0.00 7.59 7.59 0.00 6.14 0.00 tdf 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 48.68 48.68 0.00 7.17 0.00 tdg 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 30.45 30.45 0.00 4.98 0.00 tdh 0.00 0.00 0.00 0.00 0.00 0.00 39.09 0.00 1.45 1.45 0.00 0.60 0.00the columns with the wait timings are much higher than the from the fast host
that’s very strange from my point of view.further the CPU stat does not shows correct values because the fast host was at the time of the command under heavy load with about 80%.
on the slow was some load but there the CPU is much stronger
@bleader: the comand "get-cpufreq-average" gives no output at all.
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@high-voltages so nothing there hints you to a problem with the drive SDA on the slow "host"?
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@high-voltages you also can try
xenpm start 10to gather info for 10s and it will print a sumarry at the end, in my case it had each core average frequency, not sure you'll get it too, but you can give it a shot. -
@bleader I am running into the same issue on a pair of Lenovo SR630 V4s with Intel Xeon 6530P CPUs
[08:23 xcpng-dr-2 ~]# xenpm get-cpufreq-para [CPU0] failed to get cpufreq parameterPlaying with different workload profiles in the bios but so far the server seems to pretty aggressively clock itself down even while CPU intensive tasks like backups are running. I am of course not able to run something like xenpm set-scaling-governor performance either.
EDIT: The solution here is to get "Power/Performance Bias:" to OS Controlled in the servers BIOS. This restores functionality.
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@flakpyro oh, good to know, thanks for sharing this!
@poddingue this might be worth some investigation to document, but likely would need to gather similar settings for a set of vendors to make it relevant.
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