Degraded IO performance on kernel 2.6.32-504.3.3

Issues related to hardware problems
gulikoza
Posts: 181
Joined: 2007/05/06 20:15:23

Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by gulikoza » 2015/08/08 11:08:44

Centos 6.7 has rebased irqbalance to 1.0.7, so that particular issue should be solved. However you should check if that solves your problem as well...

Kirys
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Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by Kirys » 2015/08/08 16:25:09

I'll try

Kirys
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Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by Kirys » 2015/08/12 10:51:30

The performance are still degraded but there is a change with this kernel.
After a fresh boot the performance are really similar to the performance of 2.6.32-431.29.2 but the next day they become worse and slow like the 2.6.32-504.3.3.
This did not happen with 504 (I've made many tests and rebooted many times), and doesn't happen with the 403 (the performance are always good)

Code: Select all

[kirys@dax ~]$ lsb_release -a && uname --all
LSB Version:    :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description:    CentOS release 6.7 (Final)
Release:        6.7
Codename:       Final
Linux dax.network 2.6.32-573.1.1.el6.x86_64 #1 SMP Sat Jul 25 17:05:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Kirys
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Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by Kirys » 2015/08/24 17:02:50

Checked latest kernel the behaviour is the one described recently, good performance on fresh boot, bad performance the day after....

Kirys
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Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by Kirys » 2016/01/07 18:31:48

Performance degradation is still here with latest kernel :(

susobhan
Posts: 1
Joined: 2016/05/06 19:52:55

Re: Degraded IO performance on kernel 2.6.32-504.3.3

Post by susobhan » 2016/05/06 20:00:52

I have written one nvme rdma driver.Initially it was a bio based driver.Now I change it to request based. I have not seen any performance drop in centos 7 but I experienced a huge performance degradation( specially read performance) in centos 6.6. I tried disabling irqbalanced but did not help much. Could anyone tell me what should I do here.

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