Comments for don at nz.net http://www.don.nz.net/wordpress pushing packets for money Sun, 29 Aug 2010 06:53:13 +0000 hourly 1 http://wordpress.org/?v=3.0.1 Comment on Oh, there’s the any key! by don http://www.don.nz.net/wordpress/?p=76&cpage=1#comment-100 don Sun, 29 Aug 2010 06:53:13 +0000 http://www.don.nz.net/wordpress/?p=76#comment-100 Well, like I said, I'm not a fan of the IBM battleship keyboards because of the noise. Keyboards are such a personal thing; I had a favourite back in the green (or amber) screen days which a colleague described as "like typing on M&Ms". On the other hand, I despised the DEC LK201 keyboards as feeling spongy, but always found that they were very easy to type accurately on despite their various annoyances. Well, like I said, I’m not a fan of the IBM battleship keyboards because of the noise. Keyboards are such a personal thing; I had a favourite back in the green (or amber) screen days which a colleague described as “like typing on M&Ms”.

On the other hand, I despised the DEC LK201 keyboards as feeling spongy, but always found that they were very easy to type accurately on despite their various annoyances.

]]> Comment on Oh, there’s the any key! by Mike http://www.don.nz.net/wordpress/?p=76&cpage=1#comment-99 Mike Sun, 29 Aug 2010 02:06:12 +0000 http://www.don.nz.net/wordpress/?p=76#comment-99 They just don't make keyboards like they used to, do they? I've been using an IBM keyboard from a 286 for at least fifteen years now; the sticker on the bottom says it was manufactured in November 1991. Still going strong, despite what must be a couple million words typed on it over the years. I like it so much I actually have a spare in a closet, plus a couple extra cables. Back then, they made 'em to last. The four-year-old Cherry keyboard on my other computer is already developing sticky keys and other annoyances, and it's probably not long for this world. You'd think that if anyone was going to still make a decent keyboard it'd be the Germans, but apparently not... They just don’t make keyboards like they used to, do they? I’ve been using an IBM keyboard from a 286 for at least fifteen years now; the sticker on the bottom says it was manufactured in November 1991. Still going strong, despite what must be a couple million words typed on it over the years. I like it so much I actually have a spare in a closet, plus a couple extra cables. Back then, they made ‘em to last. The four-year-old Cherry keyboard on my other computer is already developing sticky keys and other annoyances, and it’s probably not long for this world. You’d think that if anyone was going to still make a decent keyboard it’d be the Germans, but apparently not…

]]> Comment on Bandwidth Delay Product by Radek Burkat http://www.don.nz.net/wordpress/?p=19&cpage=1#comment-49 Radek Burkat Sun, 14 Feb 2010 03:17:16 +0000 http://www.don.nz.net/wordpress/?p=19#comment-49 An addition to this is that an initial connection starts off in slow start, which basically limits the first transaction to 2 segments, and then doubling to get to your 64k windows. So if you are serving an item that is say, 22k, you will wait 4 RTTs that's 800ms (assuming 200ms RTT)...pretty silly. Assuming 1.5k segments, the first RTT will yield 3k, then 6k, then 12 k, etc A tip that I do, for my web server is to tweek the tcp stack in linux to increase the slow start value. (this is not configurable but hard coded in most kernels), but easy to alter and recompile. If are looking to reduce latency, this is a nice thing to know. Great articles btw. An addition to this is that an initial connection starts off in slow start, which basically limits the first transaction to 2 segments, and then doubling to get to your 64k windows.
So if you are serving an item that is say, 22k, you will wait 4 RTTs that’s 800ms (assuming 200ms RTT)…pretty silly. Assuming 1.5k segments, the first RTT will yield 3k, then 6k, then 12 k, etc
A tip that I do, for my web server is to tweek the tcp stack in linux to increase the slow start value. (this is not configurable but hard coded in most kernels), but easy to alter and recompile.
If are looking to reduce latency, this is a nice thing to know.
Great articles btw.

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