Bad Performance CPU? get-cpufreq-para failed
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Hi,
Check in your BIOS that you are in performance mode or equivalent.
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I have checked the BIOS: PowerManament is set to static Performance
there was no change...the CPU parameter are still not avail
further the HDD load in the VM is strange, the disk load is without any started app permanently at 100%
High Disk load without any started app:
high CPU load after start without any started app:
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So your issue is probably more storage related than CPU related
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@olivierlambert I think it could be both... but how can i figure it out where are the this came from?
it is a fresh installed system.
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It's hard to tell, you have the infrastructure "in front of you", while I have 0 knowledge here.
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that is correct, but there are no errors in the storage system. the raid is built with two Raid 10 arrays SAS disks. the performance should be there.
a better question should be, how to figure it out driver issues?
The issue with the CPU looks strange and i don´t know how to find out why the cpu data could be not show with xenpmI think I will make some test with a linux vm look how the performance is there.
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You must provide more technical details on the entire system/setup, including the storage & network.
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This also happens on our servers.
This is from a single node homelab running on a Dell PowerEdge r620
# xenpm get-cpufreq-para [CPU0] failed to get cpufreq parameter [CPU1] failed to get cpufreq parameter [CPU2] failed to get cpufreq parameter [CPU3] failed to get cpufreq parameter [CPU4] failed to get cpufreq parameter [CPU5] failed to get cpufreq parameter [CPU6] failed to get cpufreq parameter [CPU7] failed to get cpufreq parameter [CPU8] failed to get cpufreq parameter [CPU9] failed to get cpufreq parameter [CPU10] failed to get cpufreq parameter [CPU11] failed to get cpufreq parameter [CPU12] failed to get cpufreq parameter [CPU13] failed to get cpufreq parameter [CPU14] failed to get cpufreq parameter [CPU15] failed to get cpufreq parameter [CPU16] failed to get cpufreq parameter [CPU17] failed to get cpufreq parameter [CPU18] failed to get cpufreq parameter [CPU19] failed to get cpufreq parameter [CPU20] failed to get cpufreq parameter [CPU21] failed to get cpufreq parameter [CPU22] failed to get cpufreq parameter [CPU23] failed to get cpufreq parameter [CPU24] failed to get cpufreq parameter [CPU25] failed to get cpufreq parameter [CPU26] failed to get cpufreq parameter [CPU27] failed to get cpufreq parameter [CPU28] failed to get cpufreq parameter [CPU29] failed to get cpufreq parameter [CPU30] failed to get cpufreq parameter [CPU31] failed to get cpufreq parameter [CPU32] failed to get cpufreq parameter [CPU33] failed to get cpufreq parameter [CPU34] failed to get cpufreq parameter [CPU35] failed to get cpufreq parameter [CPU36] failed to get cpufreq parameter [CPU37] failed to get cpufreq parameter [CPU38] failed to get cpufreq parameter [CPU39] failed to get cpufreq parameter [CPU40] failed to get cpufreq parameter [CPU41] failed to get cpufreq parameter [CPU42] failed to get cpufreq parameter [CPU43] failed to get cpufreq parameter [CPU44] failed to get cpufreq parameter [CPU45] failed to get cpufreq parameter [CPU46] failed to get cpufreq parameter [CPU47] failed to get cpufreq parameter# cat /proc/cpuinfo | egrep -i mhz cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 cpu MHz : 2700.059 -
@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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EDIT: The solution here is to get "Power/Performance Bias:" to OS Controlled in the servers BIOS. This restores functionality.
hey nice !
I did the modification on a slave server and I now have all informations (previously FAILED)
it's an HPE DL380 Gen 11
modified in the iLO web ui, but then needed to reboot hostwas previously on DYNAMIC POWER SAVINGS
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On a Lenovo SR630 V4 it took
Power/Performance Biasset toOS Controlled, and on an HPE DL380 Gen 11 it was the iLO Power Regulator moved off Dynamic Power Savings toOS Control Mode, with a host reboot.
Both then returned real values fromxenpm get-cpufreq-parainstead of the failure line.
@bleader is right that two vendors is not enough to document, so if your host works, could you post the vendor, the exact setting name, where it lives, and whether you needed a reboot? Dell, Supermicro and anything AMD are the obvious gaps.
I don't know whether the firmware is withholding p-state control outright or just not publishing the ACPI objects Xen looks for, so I would rather collect settings than write up a mechanism I can't back.Thanks!
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P poddingue marked this topic as a question
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