Monday, September 16, 2013

The gymnastics required to just do a "HALT" for MIPS..

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So, it turns out there's no nice, guaranteed way to implement a HALT style setup for MIPS in the idle thread in the kernel. I'll bra...
Tuesday, September 3, 2013

Finding low hanging fruit with PMC, or "O(wtf)" ?

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I've lately been focusing on performance counter stuff on Sandy Bridge (Xeon and non-Xeon.) Part of this has been fixing some of the cou...
Monday, August 19, 2013

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This blog post is mostly so I don't forget this kind of stuff. http://software.intel.com/sites/default/files/m/a/d/2/2/e/15529-Intel_V...
Tuesday, August 13, 2013

Profiling on superscalar architectures, or "no, instruction counts don't necessarily matter nowdays.."

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I could spend a lot of time brain dumping various things to do with profiling on anything more recent than Pentium 1 (or, well, anything rem...
2 comments:
Wednesday, August 7, 2013

Why, oh why am I seeing RST frames from FreeBSD when I have a high connection rate?

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I started seeing something odd in my testing. I was only getting around 120-odd new connections a second being accepted by the test server. ...
1 comment:
Tuesday, August 6, 2013

Hacking on the Intel 10GE driver (ixgbe) for fun and .. not-crashing

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My job at Netflix can be summed up as "make the Open Connect Platform better." This involves, among other things, improving FreeBS...
3 comments:
Saturday, June 29, 2013

Doing traffic with the Carambola 2..

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Now that the port is working, I've started doing some traffic with the carambola 2 board on FreeBSD. So far, so good: # athstats 5...