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0
votes
1answer
39 views

UFS wedge : “Out of journal space!” - how to tune? (FreeBSD)

I'm running FreeBSD 9.2p13 with UFS and journaled softupdates. Does anybody know how to tune softupdates journal on UFS? There are no suitable information in handbook, man pages or sysctl ...
0
votes
2answers
91 views

Beyond 1Gb upload on a single linux server

I have a high hit nginx web server on CentOS that provides static large content. when the number concurrent connection are low, server could easily provide up to 4Gb of traffic , but when the number ...
0
votes
1answer
279 views

Postfix seems too aggressive while sending newsletters

I'm having a problem sending newsletters to certain domains/servers, like yahoo or minor network providers. It's like I'm spamming their servers with connections and they tell me to stop after a short ...
1
vote
0answers
55 views

IRQ not handled by all CPUs

I have a problem about balancing irq. I took irq numbers from /etc/interrupts and assigned each irq to each of 24 CPUs as this tutorial says for i in {143..166};do cat /proc/irq/${i}/smp_affinity; ...
1
vote
3answers
130 views

freebsd 7.2 kern.threads.max_threads_per_proc doesn't change after reboot

I have some multithread apps on my server machine based on FreeBSD 7.2, so because of this I need to increase kern.threads.max_threads_per_proc to 4000 (default value is 1500). I changed it using ...
0
votes
1answer
202 views

mongodb : Can create new thread on FreeBSD?

We experienced some strange thing in our mongodb gridfs platform. The platform actually is a bi Xeon E5 (bi quad core) with 128GB of memory, running on freebsd 9 with a zfs pool dedicated for mongodb. ...
1
vote
4answers
572 views

FATAL: Error inserting acpi_cpufreq

Trying to see how to force CPU to run at higher freq on a HP ProLiant system with SLES 11 SP2. /# modprobe -vv acpi-cpufreq insmod ...
0
votes
2answers
337 views

Why is G-Wan performance so low on Opteron?

I am testing G-Wan 4.3.14 on CentOS 6 with the 2.6.32 Linux kernel using an Opteron 6234 6 module / 12 core processor. Running a simple weighttp test I get: weighttp -k -n 1000000 -t 6 -c 1000 ...
1
vote
1answer
162 views

Tune web server based on stats by munin

At our company, we have set up a munin node to gather data about our web server every five minutes. These datas are presented in a graph, and we're wondering if there is anything to gain from tuning ...
3
votes
3answers
3k views

NGINX + PHP-FPM + MYSQL - High CPU, Low RAM

All of a sudden our server started to act really weird, extremely high CPU usage and low RAM usage. I've never seen this before and I'm not sure what to do. I feel like if I could get the system to ...
14
votes
1answer
20k views

What value of thread_cache_size should I use?

I'm using Asp.Net together with MySQL. In the .Net connection string, I have set Max Pool Size to 150. If I run the following I get these values: SHOW GLOBAL STATUS LIKE 'max_used_connections'; ...
1
vote
2answers
912 views

How can I see if apache is overloaded and dropping or not accepting connections?

Basically I just want to see if apache is handling a current level of high traffic or if I need to tune it to handle more connections. (I have found plenty of information on the actual tuning, so no ...
9
votes
4answers
9k views

Need to increase nginx throughput to an upstream unix socket — linux kernel tuning?

I am running an nginx server that acts as a proxy to an upstream unix socket, like this: upstream app_server { server unix:/tmp/app.sock fail_timeout=0; } server { listen ...
3
votes
3answers
2k views

Apache performance issue, after “1000 total children” Apache no longer responds to HTTP requests. Not MaxClients issue?

Hoping someone can point me in the right direction as I've spent the last week trying to figure out where the "issue" is but haven't been able to, tried posting to the Apache users mailing lists but ...
2
votes
1answer
1k views

MySQL com_select?

I'm looking to tune my query cache a bit. According to 7.6.3.4. Query Cache Status and Maintenance in the manual: The Com_select value is given by this formula: Qcache_inserts + ...
1
vote
2answers
523 views

Best network tuning variables for a Linux proxy

What are the best settings to tune so that Linux can handle a very large amount of TCP connections such as would be seen by a proxy server or a webserver? I'm using Centos6 and squid and am seeing a ...
14
votes
3answers
36k views

MySQL lowering wait_timeout value to lower number of open connections

I run a rather busy site, and during peek hours I see over 10.000 open connections to my database server on my webserver when a run a netstat command. 99% of the connections are in the TIME_WAIT ...
3
votes
2answers
2k views

Picking the right innodb_buffer_pool_size

I have a 24GB machine running MySQL (only InnoDB tables). My innodb data set is 11.5GB big, and i have set my innodb_buffer_pool_size to 14GB to allow some growth. So the entire innodb data set is ...
3
votes
2answers
6k views

Exhausting Linux machine TCP socket limit (~70k)?

I am the founder of torservers.net, a non-profit that runs Tor exit nodes. We have a number of machines on Gbit connectivity and multiple IPs, and we seem to be hitting a limit of open TCP sockets ...
2
votes
3answers
4k views

Apache tuning with very high-load LAMP server

I have a LAMP server that can be serving ~400 requests per second at times, the server configuration is: CPU: Intel Quad Core Xeon X3430 (4 x 2.40 GHz, 8MB Cache) RAM: 16 GB REG ECC DDR3 HD: 500 GB ...
3
votes
3answers
1k views

Assigning Processes to CPU Cores

I have access to a CentOS 6 web server (a PHP/MySQL forum) running Apache 2.2.15 and MySQL 5.1.52. This box has dual oct-core Xeons. What I find looking over the CPU graphs is that the first two ...
1
vote
2answers
1k views

Postfix tuning for high amount

I have do some benchmarks with postfix, where we send out 6 KB HTML Mails. We followed all tuning instructions published by Postfix and used Ramdisk for the queue. We was not able to send above 50 ...
0
votes
2answers
498 views

Tuning Apache memory usage

I've been working on on getting my webserver in check and I'm running into some issues. First of all, using top I've noticed that Apache is using a lot of memory, no surprise really, but 130-150M per ...
19
votes
4answers
1k views

Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk?

Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk? I would have expected the Physical disk to be slightly faster but in fact the process ran 100 times faster ...
1
vote
1answer
282 views

fine tuning of my.cnf for InnoDB tables fails with setting of: `innodb_log_file_size=256`

I read some fine tuning recommendations on the mysqlperfomanceblog and tryed to adapt them. I added to my.cnf: innodb_buffer_pool_size = 1000M innodb_log_file_size = 256M After ...
-1
votes
1answer
211 views

Linux script to check settings and recommend tuning changes? [closed]

I'm searching for a script to run on our linux server and recommend various tuning changes we might consider making, as well as their suggested values for consideration. Any ideas if something like ...
2
votes
2answers
135 views

MySQL query times for tuning are different every time

I am tuning SQL query time for my slow query but every time I get different times so I can't evaluate my optimize solution. For example, I run query select * from abc where abc.status in (x,y,z) and ...
2
votes
1answer
786 views

RHEL - tcp_delack_min sysctl parameter missing on realtime kernels

I'm looking to modify the tcp_delack_min sysctl tunable on several RHEL/CentOS systems. It should be located at /proc/sys/net/ipv4/tcp_delack_min. I'm finding that it is missing in recent kernels. ...
4
votes
1answer
509 views

Behaviour of solaris tcp stack with relatively high RTT and bursty traffic

I have an application that is distributing data from New York to Tokyo over TCP running Solaris 10. Mean throughput is < 1Mbps, peak throughput can reach 20-30Mbps for seconds at a time though ...
2
votes
2answers
553 views

Linux Disk tuning help

I have a Software RAID1 disk that is randomly experiencing very slow read times. hdparm -t /dev/md0 /dev/md0: Timing buffered disk reads: 2 MB in 12.43 seconds = 164.80 kB/sec It appears to be ...
0
votes
1answer
192 views

Configuring apache to run in minimal memory

I have a micro instance of Ec2 with Django connected to apache via wsgi. Whenever I hit the server httpd hits top of the CPU and memory cycle and page consequently take some time to load. Can ...
0
votes
1answer
284 views

what's the best webserver configuration for this setup?

I have a webserver running on an IBM blade, hardware configuration is: Intel Xeon E5506 x 2 (8 cores) 12G mem SAS disk raid1 I use this box as a dedicated webserver serving a dozen of simple php ...
7
votes
1answer
540 views

Tuning Linux's ipv6 stack

I'm working on a Linux network deice, and there are some tcp/ip settings that don't seem to have ipv6 equivalents. IP forwarding is a common setting, and available in both stacks net.ipv4.ip_forward ...
1
vote
3answers
340 views

Config MySQL to maximum speed and memory

I have a server, 8 cores, 12 GB RAM. This server is only used to run MySQL. So, help me config /etc/my.cnf to maximum speed, memory for MySQL.
1
vote
3answers
1k views

Filesystem/Options for intensive random I/O

I'm planning to (privately) deploy a server that will be hammered with random I/Os in files ranging from 100MB to 50GB. The requests will range from 128 KB to 4MB. The profile will be 50:50 concerning ...
6
votes
1answer
2k views

Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to ...
10
votes
4answers
28k views

kjournald reasons for high usage

I'm trying to figure out why is kjournald going crazy on my machine. It's an 8-core box with loads of memory. It's got ~50% cpu load. The iotop doesn't seem to point at any specific processes - some ...
0
votes
2answers
179 views

How do I calculate the amount of tuning needed for my server?

I have a server which is running a few discrete Python, Java application which most of the time imports data into a PostGreSQL database. I would like to know from people out there who have experience ...
0
votes
1answer
701 views

Nginx causing high load with not many active connections

I have a linux machine 64bit (centos5.5), 2.83GHz Q9550, 6gb ram and a single SATA 500gb drive. From this machine I only serve thumbnails, most around 10kb in size and at this point there are about 7 ...
1
vote
3answers
825 views

Solaris tcp_keepalive_abort_interval

There is a section in Solaris reference manual for tcp_keepalive_abort_interval. However, it doesn't appear in ndd /dev/tcp \? listing. # uname -srvmpi SunOS 5.10 Generic_142909-17 sun4us sparc ...
1
vote
0answers
107 views

How Tune the best PostgreSQL for developers not for production?

Developing software on a laptop or a desk computer, what would the best configuration for make sure developers has a fast connections and response. For example a laptop with: 2 cores, 2GB of ram and ...
0
votes
1answer
556 views

Setting MySQL table_cache variable

Greetings, I've set the table_cache variable in /etc/mysql/my.cnf on Ubuntu to 512, but the reported value is only 64. How can I fix this? Thanks
2
votes
4answers
795 views

Tune SQL Server Express using Profiler?

I have a SQL Server 2005 database... a copy of it is running in development on a full version of SQL server. Another copy is running in SQL Server 2005 Express on a web server. I've used SQL Profiler ...
1
vote
1answer
266 views

Reducing max memory settings in SQL 2005

We have a 2003 cluster with 32GB of memory. It hosts two SQL 2005 DB instances, one Reporting instance and runs SSIS packages throughout the day. The main instance is set to 22GB of memory, the ...
7
votes
4answers
8k views

Apache2 PHP Site - Hitting MaxClients limit - diagnosing?

We have a moderate-traffic site (roughly 20,000 hits a day), running a PHP/MySQL app on Apache 2.2, Ubuntu 9.10 Server, from an Amazon EC2 c1.small instance (1.7 Gb of RAM). We had issues with the ...
7
votes
5answers
6k views

How to fine-tune our MySQL server?

MySQL is not my thing, yet I need to fine-tune one of our servers. Here are the requirements/specs: The MySQL server has only one significant database We only have one "type" of application ...
51
votes
8answers
100k views

What limits the maximum number of connections on a Linux server?

What kernel parameter or other settings control the maximum number of TCP sockets that can be open on a Linux server? What are the tradeoffs of allowing more connections? I noticed while load testing ...
15
votes
4answers
18k views

How to identify I/O bottlenecks on a Linux server?

How do you determine that the performance of your Linux server is I/O bound and, perhaps more importantly, what process or processes are casuing the problem?
6
votes
1answer
1k views

ext3 file system performance tuning: what metrics to monitor

I have a high-IO application that is working, and scaling well to date. Over the past few months we've been trying to look down the road and predict where our next bottlenecks will occur. One of ...