I’ve got some performance problems with a mail server that’s using DRBD so I’ve done some benchmark tests to try and improve things. I used Postal for testing delivery to an LMTP server [1]. The version of Postal I released a few days ago had a bug that made LMTP not work, I’ll release a […]
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I have released version 1.96 of Bonnie++ in the experimental branch [1]. The main changes are: Made it compile on Solaris again (version 1.95 broke that) Now supports more files for the small file creation test (16^10 files is the limit), and it handles an overflow better. Incidentally this will in some situations change the […] Almost two years ago I blogged about a strange performance problem with SATA disks [1]. The problem was that certain regions of a disk gave poor linear read performance on some machines, but performed well on machines which appeared to be identical. I discovered what the problem was shortly after that but was prevented from […] I have just released version 1.03e of my Bonnie++ benchmark [1]. The only change is support for direct IO in Bonnie++ (via the -D command-line parameter). The patch for this was written by Dave Murch of Violin Memory [2]. Violin specialise in 2RU storage servers based on DRAM and/or Flash storage. One of their products […] I’ve just started work on a new HP server running RHEL5 AS (needs to be AS to support more than 4 DomU’s). While I still have the Xen issues that made me give up using it on Debian [1] (the killer one being that an AMD64 Xen Dom0 would kernel panic on any serious disk […] I have just been running some ZCAV tests on some new supposedly 1TB disks (10^40 bytes is about 931*2^30 so is about 931G according to almost everyone in the computer industry who doesn’t work for a hard disk vendor). I’ve added a new graph to my ZCAV results page [1] with the results. One interesting […] The way Xen works is that the RAM used by a virtual machine is not swappable, so the only swapping that happens is to the swap device used by the virtual machine. I wondered whether I could improve swap performance by using a tmpfs for that swap space. The idea is that as only one […] As correctly pointed out by cmot [1] my previous post about software RAID [2] made no mention of bus bandwidth. I have measured the bus bottlenecks of a couple of desktop machines running IDE disks with my ZCAV [3] benchmark (part of the Bonnie++ suite). The results show that two typical desktop machines had significant […] Dear lazyweb, I want to design T-Shirts for my Bonnie++ and Postal projects. But representing those projects in a picture seems more difficult than SE Linux (see one of my SE Linux T-Shirt designs below). If you have any conceptual design ideas then please let me know. Here are my current designs for SE Linux […] |
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