[geeks] Network software pointer

[John Francini]

One way to keep Wireshark from getting too gorged on packets is to limit the size per packet. I find that limiting the packet capture size to the first 128 or 256 bytes keeps the bloat down. I do this because I usually don't care about the packet content so much as the packet headers.  And since most of the time at work I'm capturing iSCSI packets on a 9000-byte MTU network, things bloat up real fast without packet size limiting.

j

Sent from my iPad

On Jul 2, 2012, at 21:16, David Eisner <deisner at gmail.com> wrote:

> On Jul 2, 2012 6:44 PM, "Andrew Jones" <andrew at jones.ec> wrote:
> 
>> On 07/02/2012 05:21 PM, David Eisner wrote:
>> 
>>> 
>>> I'm paying for 25 Mbps up/down, and when I used various online
>>> bandwidth testers (speedtest.net, etc.) I did measure bandwidth that
>>> good or higher. But the (excellent) support person at Netflix
>>> confirmed that I was getting only 720p -- with the occasional burst to
>>> 1080 -- while I was streaming and on the phone with him.
>>> 
>>> 
>> Virtually all Netflix content is 720p.   Netflix can vary the bitrate of
>> the stream to match conditions, but as far as I know, they don't transcode
>> 1080 content to 720 or vice versa.
> 
> 
> To be specific, I was comparing the experience of watching Mad Men over a
> TiVo Premier XL. Like most people who watch HD content (I imagine), I can
> easily perceive the difference between 720* content and 1080* content.
> Previously Mad Men's appearance was consistent with what I consider 1080
> sharpness, and with what I see watching on AMC HD.  There was some bad
> posterization [1] at times though.
> 
> It was immediately obvious when I watched Mad Men at the new place that the
> quality was poorer. It would occasionally sharpen up for 5 to 10 seconds,
> but then it would suddenly become blurry again. I can only tell you that
> Netflix support told me that they could see on their end that I was getting
> 720 definition with occasional improvement to 1080, and this before I told
> them it was sharp once in awhile.
> 
> Whatever the case, the quality is now consistent with what I used to see
> (except for the first few seconds of any stream -- this appears to be an
> issue with the new Netflix app on TiVo -- a confounding variable.)
> 
> -David
> 
> [1] http://en.wikipedia.org/wiki/Posterization
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