Questions tagged [tuning]

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How to find max limit of /proc/sys/fs/file-max

I am running Jenkins with lots of jobs which require lots of open files so I have increased file-max limit to 3 million. It still hits 3 million sometimes so I am wondering how far I can go. Can I set ...
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0answers
13 views

Ram buffer from network transfers, what parameters determine it?

Firstly, I'll qualify my statements. I've been told that network transfers are buffered through ram when using Linux. So, if i have for example, an unraid server which from what I understand is a ...
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0answers
124 views

tune2fs for f2fs

Is there a tool for editing (and viewing) the file system features for f2fs just like tune2fs for ext234? For instance you can get summarized info about the corresponding extX partition: # tune2fs -...
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3answers
3k views

How to change the length of time-slices used by the Linux CPU scheduler?

Is it possible to increase the length of time-slices, which the Linux CPU scheduler allows a process to run for? How could I do this? Background knowledge This question asks how to reduce how ...
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0answers
54 views

is there any way to increase spawn rate of MinSpareServers in apache prefork

My server faces huge traffic only for short duration every day. And I don't want to waste my resource by running high amount of MaxSpareServers throughout the day. So, I would like to know is there ...
1
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1answer
602 views

CentOS 7 - When THP is disabled is it safe to ignore defrag setting?

I need to disable THP (Transparent Huge Pages). Many tutorials on the web advise to set never (0 for last one) value for below options. /sys/kernel/mm/transparent_hugepage/enabled /sys/kernel/mm/...
1
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1answer
326 views

slow/frozen ext4 // task sync blocked on big mostly write only server

We have several 90TB servers (Areca RAID-6 partitioned into 10 ext4 partitions) The application is basically a ring buffer; continuously writing data and deleting old data. As such, each partition is ...
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1answer
901 views

How can I create my own custom progress bar in Conky?

I have started using Conky some days ago, and I'm willing to create my own configuration. I have added some colors, cool ASCII art and learned the basics. However, I don't like the default progress ...
4
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0answers
216 views

systemd slices even with low CPUShare heavily affect system responsiveness

I've created custom slice (so now I have 4 slices user, system, machine, important) and assigned huge number to CPUShares. System felt really unresponsive under high load in this slice, what seems to ...
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1answer
230 views

Fast filesystem for virtual backup environments

I know filesystem supporters war is behind the corner and there are plenty of fine tuning guide for each filesystem in the wild, so please stick to the specifications: I'm asking what would you ...
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1answer
2k views

Does dm-multipath schedule I/O?

I have a multipath device I'm interested in: [root@xxx dm-7]# multipath -ll mpathf mpathf (3600601609f013300227e5b5b3790e411) dm-7 DGC,VRAID size=3.0T features='1 queue_if_no_path' hwhandler='1 alua' ...
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1answer
938 views

Make TCP to reconnect automatically and quickly

In my Debian Linux system apt-get dist-upgrade is sometimes stalled with [Waiting for headers] message. To make it pass faster I press Ctrl+C and start the command again. How to tune the system to ...
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0answers
2k views

Tuning NFS: Identifying source of getattr requests

we run some Linux NFS clients against a NetApp NFS storage system. Currently we have over 50% getattr requests running against the NetApp using up precious CPU cycles. Using the netapp-top.pl script ...
2
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1answer
806 views

Memory Usage in Linux [duplicate]

How to setup limit for process to memory usage? Similar to open files limit in /etc/security/limits.conf: ubuntu soft nofile 4096 ubuntu hard nofile 8192 ...
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1answer
2k views

Is it possible to stop specific BIND Log messages from being logged?

I have setup a BIND DNS server and a munin monitoring system which is configured to monitor BIND as well. The OS is Ubuntu Server 12.04.4 and the BIND version coming with it is 9.8.1-P1. Munin runs ...
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0answers
38 views

If a buggy application underperforms, it it possible server tuning could have no affect?

To set the stage, imagine if you will: A read-heavy Tomcat Application with MySQL on Red Hat Enterprise Linux with some problematic Java Class files which resulted in the application performing a ...
4
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1answer
2k views

CentOS 5 - hdparm - how to set DMA mode

I'm running CentOS 5 with a PATA hard drive. I've used hdparm to tune the hard disk for better performance, but there are 2 settings that don't work: hdparm -M 254 /dev/hda gives the error ...
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2answers
3k views

error: “net.inet.ip.fastforwarding” is an unknown key

I've been doing some research into improving performance for OpenVPN and I found out about setting fastforwarding to 1 but when I tried I got the error error: "net.inet.ip.fastforwarding" is an ...