Tag Archives: tuning

bind GENERATE and CDN

Posted by on November 10, 2014 No comments

In our advertising network we use landing page with great number of images.

And previous team use domain static.OURDOMAIN.net for CDN. But modern browsers open from 4 to 6 simultaneous connections to one domain name. So it takes huge ammount of time to load all page.

i.e. 4 images start loading, browser waits for 1 image load complete, next image loading.
Damn not good and extremely slow 🙂
so use force Luke:

bind zone:

$GENERATE 1-64 static$      IN  A   1.1.1.1     ;s7
$GENERATE 1-64 static$      IN  A   2.2.2.2     ;sgr1
$GENERATE 1-64 static$      IN  A   3.3.3.3     ;sf6
$GENERATE 1-64 static$      IN  A   4.4.4.4     ;sf31

And Use something like http://static.’random(1-64)’.OURDOMAIN.net/IMAGE.PNG in application code.

We significantly speed up page loading. (up to 3 times).

ext4 perfomance tuning

Posted by on May 17, 2014 No comments

I use following mount options.
In some projects it gives significant performance boost.

errors=remount-ro – need for hardware problem case. Because if disc remains mounted, further writing attempts can deadly damage file system. And one more case – easy monitoring. Just check via zabbix or nagios that you have no ro file system.

noatime, nodiratime – not fix access time. Double check that your applications doesn`t need this.

discard – use trim for SSD drive. In case SATA or SAS this option ignored by system.
commit, nobarrier – dangerous in case of power outage. But for my infrastructure o.k.

ext4 errors=remount-ro,noatime,nodiratime,commit=100,discard,nobarrier

And SED for fstab fixing (I use puppet, chef, fabric).

sed -r -i 's/ext4\s+defaults/ext4 errors=remount-ro,noatime,nodiratime,commit=100,discard,nobarrier/' /etc/fstab