David C. Rankin wrote:
On 07/24/2014 10:13 AM, Linda Walsh wrote:
Math?
1920x1080x3 (assuming 24bits/pixel for color x 30 frames / second = 186624000 = 186.6 Mb/s.
Your fast speed on your ethernet is 100Mb/s.
Linda,
Are you talking about a 100TX or 1000TX connection? I'm guessing you are talking about the average real-world throughput over 1000TX, because on a 100TX segment, it would be about 1/10th that.
Actually at least a double error -- I went for "bytes" (the mul*3 @24bits/pixel) then used the wrong suffix, and then stupidly compared that to 100Mb (original author said his interface was a 10/100). So yeah... its even more impossible than I suggested. so the above should have been 1.49Gb, which as you point out, wouldn't even be possible on a 1000TX connection.
Then, if the data is cached to disk before display, at times on the 1000TX connection, you bump up against the r/w capability of older sata drives/controllers of about 70 Mb/s. I guess that's part of what happens when the video freezes and our old friend:
---- I'd be very surprised to see such rates on any HW still in service. to get speeds like that you'd have to go back to a low-density 5400RPM drive -- I was getting a bit over 100MB/s on a laptop drive 15 years ago (it was 7200RPM). Now, a single 4K SATA is spec'd at about 170-180MB/s sustained. But yeah... math and abbreviation errors != clear communication. Thanks for the catch! -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org