Tsuna's blog

For a lot of people, the conventional wisdom is that XFS outperforms ext4. I'm not sure whether this is just because XFS used to be a l...

These days, the Hitachi 7K3000 seems like the best bang for your bucks. You can get 2TB disks for around US$100. The 7K3000 isn't an ...

XFS has terribly bad performance out of the box, especially on large RAID arrays. Unlike ext4, the filesystem needs to be formatted with th...

At StumbleUpon we've had a never ending string of problems with Broadcom's cards that use the bnx2 driver. The machine cannot hand...

If you ever run into this message while using the Sun JVM / OpenJDK: Java HotSpot(TM) 64-Bit Server VM warning: GC locker is held; pre-dump ...

After reading the excellent post on The MySQL “swap insanity” problem and the effects of the NUMA architecture , I remembered about the exis...

At StumbleUpon we've been tracking down a weird problem with one of our application servers written in Java. We run Sun's jdk1.6.0_...

I recently did some work on some of our frontend machines (on which we run Varnish ) at StumbleUpon and decided to track down some of the er...

I have a fairly simple problem: I want to count the number of lines in a file, then seek back to after the first line, and then read the fil...

I will be speaking about OpenTSDB at the Strata conference , Wednesday, February 02, 2011, in Santa Clara, CA. You can sign up with this ...