Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello m, Thursday, January 19, 2017, 5:17:48 PM, you wrote: >>> In the mean time, if you have not disabled it, you should find some >>> collected statistics from sysstat/sar. >>> Look at the sarXX files under /var/log/sa. They should be kept for 30 >>> day >>> by default in CentOS 7. >> >>

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello Gordon, Thursday, January 19, 2017, 4:57:48 PM, you wrote: > On 01/19/2017 06:29 AM, Subscriber wrote: >>> and what kind of IO patterns do those VMs >>> have? >> Do not quite understand. What do you mean? >> > What at the VMs doing? Its gateway from local network to Internet > Are they

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread m . roth
Subscriber wrote: > Hello Gianluca, > > Wednesday, January 18, 2017, 3:54:15 PM, you wrote: > >> In the mean time, if you have not disabled it, you should find some >> collected statistics from sysstat/sar. >> Look at the sarXX files under /var/log/sa. They should be kept for 30 >> day >> by

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello Gordon, Thursday, January 19, 2017, 5:09:29 PM, you wrote: > On 01/19/2017 06:54 AM, Subscriber wrote: >> But I collect such statistics in Zabbix. And the numbers and graphs >> indicate an increase in the load on the CPU (ie System time). > "load" has another meaning in the context of

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Gordon Messmer
On 01/19/2017 06:54 AM, Subscriber wrote: But I collect such statistics in Zabbix. And the numbers and graphs indicate an increase in the load on the CPU (ie System time). "load" has another meaning in the context of POSIX system performance counters. I'm pretty sure you're talking about

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello Subscriber, Thursday, January 19, 2017, 4:44:04 PM, you wrote: > Hello Gianluca, > Wednesday, January 18, 2017, 3:54:15 PM, you wrote: >> In the mean time, if you have not disabled it, you should find some >> collected statistics from sysstat/sar. >> Look at the sarXX files under

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Gordon Messmer
On 01/19/2017 06:29 AM, Subscriber wrote: and what kind of IO patterns do those VMs have? Do not quite understand. What do you mean? What at the VMs doing? Are they entirely idle? Are they doing light work, mostly reading from disks? If they're not generating disk IO, then that's not

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello Gianluca, Wednesday, January 18, 2017, 3:54:15 PM, you wrote: > In the mean time, if you have not disabled it, you should find some > collected statistics from sysstat/sar. > Look at the sarXX files under /var/log/sa. They should be kept for 30 day > by default in CentOS 7. Unfortunately,

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-19 Thread Subscriber
Hello Gordon, Wednesday, January 18, 2017, 11:52:35 PM, you wrote: > On 01/18/2017 05:34 AM, Subscriber wrote: >> Someone noticed something similar? > How is your storage arranged, It is software RAID1 + LVM > and what kind of IO patterns do those VMs > have? Do not quite understand. What do

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-18 Thread Gordon Messmer
On 01/18/2017 05:34 AM, Subscriber wrote: Someone noticed something similar? How is your storage arranged, and what kind of IO patterns do those VMs have? During recent testing, I found that the read performance of software RAID volumes was worse under 7.3 than it was under 7.2. Most

Re: [CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-18 Thread Gianluca Cecchi
On Wed, Jan 18, 2017 at 2:34 PM, Subscriber wrote: > Hello , > > After upgrading the system from CentOS 7.2.1511 to CenOS 7.3.1611 I > see that the average processing time has increased from 5-7% to 12-15% > (doubled). Not critical but it is not pleasant. Server as KVM

[CentOS] Increase CPU usage on HV after upgrade (7.2 -> 7.3)

2017-01-18 Thread Subscriber
Hello , After upgrading the system from CentOS 7.2.1511 to CenOS 7.3.1611 I see that the average processing time has increased from 5-7% to 12-15% (doubled). Not critical but it is not pleasant. Server as KVM with 5 virtual machines. Someone noticed something similar? If so, how to fix that?