We are looking to build a realtime playback machine using Linux and a RAID (5 or 10) setup. The current setup looks like: 12GB memory 5 x 7200rpm drive (software raid) centOS 6 (Kernel Linux 2.6.32-71.29.1.el6.x86_64) NVidia Quadro 5000 (driver 280.13) Intel(R) Xeon(R) CPU X5650 @ 2.67GHz I did run Bonnie++ and iozone to do some benchmark with different raid setup (5 and 10), with different fs type (ext4 and xfs), and different stripe size. [...]

To cut a long story short I’m locked into a cheap hosting package for a 2 years, and on their site they say there hosting is “fast and reliable” (its not). I’m looking to get some server speeds stats so that I’ll have an argument to be released from the contract. How can I get some statistics about the hosting speed of the server? Asked by sam First you should read exactly what the contract [...]

I set up a little NAS system for my personal use. It’s an Ubuntu system running on a fan-less Atom-powered mini ATX mainboard which I extended with a usb3 pci card to get best possible performance for the whole system. There are 2 USB3 external drives which I write to using Gigabit ethernet. I get ~12 Mb/s writing to the NAS and roughly 75 when reading. (I’m good with that reading rate.) The Ubuntu is [...]

If I increase php memory_limit could that increase the speed of a process? Or if there is more memory allowed than needed the extra resource will not be used by the system to increase speed of the current process? Asked by giorgio79 No, it will not improve the performance. This is just a limit on the maximum allowed memory consumption of a php script. If your script tries to exceed this limit, you will get [...]

My ISP has installed a fibre based dedicated internet connection at the place where I work. In the beginning the connection terminated at one of the ISP’s core routers. It resulted in a strange issue. Eventhough the assigned speed was 5mbps, when tests were done by downloading large files over http and ftp from multiple locations, the speed never went above 2mbps. But bittorrent downloads reached 5mbps. Even file download from the ISP servers were [...]

I’ve set up an SMB SSH tunnel using putty SSH client to edit my webpages directly from the server on my windows machine (also because my virtuazoo server doesn’t allow NFS). Even setting blowfish as encryption algorithm it goes ULTRA slow (2-3 KB/s) Any ideas to improve performance? Asked by elcodedocle The short answer is to simply give up on using SMB over a high-latency link. The protocol preforms badly over high-latency links because it [...]

I own a popular website, heavy on traffic and space. I can’t solely trust my hosting company with backups, plus – hardware is expensive to rent. So I am looking into hosting the website in-house. I called my ISP to set up a connection, the price is right, but maximum they can do is 50Mb/sec. I need at least 200Mb/sec and more in the future. How do hosting companies do it? Do I purchase 4 [...]

I measured the load speed of a static image file severed by nginx from my server (using pingdom service). The server should normally process this request within few seconds. My server is located in Dallas, TX. When I used pingdom Dallas server, it took 200ms to load the file. This includes DNS resolving, and data transfer. Obviously for longer transfer, it should takes longer; but surprisingly this value was 800ms for NYC and 1.5s for [...]

I’m changing the way that our DHCP/DNS stuff works at work. Currently we’ve got 3 DNS servers, and a DHCP box. All of them are VMs. There’s a circular dependency where stuff booting requires NFS, which requires DNS. So when we reboot stuff, things might come back subtly broken until the DNS is up, and we restart some services. What I want to do is have a few low power servers, probably dual core Atoms [...]

I ran this command on ssh to see CPU info: cat /proc/cpuinfo And it says: … vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 3 cpu MHz : 1400.000 cache size : 2048 KB … Why is cpu Mhz 1400 ? Wasn’t it supposed to say 3000Mhz ? OS is CentOS 6.0 the 1400 means that at which speed the processor is running [...]