Optane 900p 480G: zfs vs btrfs vs ext4 benchmarks

I recently bought a new server with an Optane 900p 480G and I decided to give zfs a try instead of using btrfs as usual (I will not use raid or other devices, just a single 900p).

I will use my Optane drive to host several KVM virtual machines.

I have been fooled to think […]

Asterisk Debian Squeeze packages with T.38 gateway, queue hints and fixed RFC4235

After releasing a patch against 1.8.11 I made Debian packages compiled with T38 gateway support. Also, I backported a fix which should (hopefully) fix call pickup with RFC4235 (notifycid=yes) and a new feature which allows to place a hint on a queue.

Here is linuxsystem’s repository: http://www.linuxsystems.it/repository/

Stay tuned for updates.

New T.38 gateway patch against Asterisk

Yesterday Asterisk- has been released, unfortunately latest irroot’s T.38 patch is still against 1.8.8. Since I’m going to upgrade my asterisk box I made a new patch out of his subversion branch and I ported it to 1.8.11. I still didn’t test it properly, but I will in the following days. Debian Squeeze packages of […]

Fast SSH file transfers with HPN patches

This is a common problem: you have some big files (for example a disk image) to transfer over a Gigabig Ethernet link and it takes too much time with SCP/SFTP . Also you probably don’t want to bother installing an ftp server, then what’s the answer?

It’s called HPN-SSH and it’s a patchset you can […]

x86_64/SSE2 optimized Serpent cipher algorithm: 3x faster

Yesterday linux 3.3.0 has been released, one of the less talked features is the new assembly optimized Serpent cipher algorithm.

Serpent is a symmetric keyblock cipher which was a finalist in the Advanced Encryption Standard (AES) contest, where it came second to Rijndael. Serpent was designed by Ross Anderson, Eli Biham, and Lars Knudsen. Source: […]

IPv4 vs IPv6 1Gbps network performance

Netperf is a benchmark that can be used to measure the performance of a network. I did a simple test over a 1Gb/s ethernet link to compare IPv4 and IPv6 overhead, here are the results:

~ # netperf -4 -H MIGRATED TCP STREAM TEST from ( port 0 AF_INET to ( port […]