91–100 of 133 posts
Thunderbolt is basically external PCIe, so this is not so surprising. High speed NICs do consume a relatively large amount of power. I have a feeling I've seen that logo on the board before.
The PCI-E logo or the “octopus in a chip” logo? I’m more interested in the latter.
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Plus 1-2.5w per active cable. You need the heatsinks as the cx4 cards expect active airflow, and active transceivers as well. I have a 10gbit dual port card in a Lenovo mini pc. There is no normal way to get any heat out of there so I put a 12v small radial fan in there as support. It works great at 5v: silent and cool. It is a fan though so might not suit your purpose.
Do you mean active Thunderbolt cable? Short Thunderbolt cables (0.8m) are passive. https://www.reddit.com/r/UsbCHardware/comments/y5uokj/commen...
Any idea why ethernet stagnated in terms of speed? There was a time it was so much faster compared to usb. Now even wifi seems to be faster. Sure one can buy nice ethernet cards and cables, but the reality is that if you grab a random laptop/desktop from best buy and a cable, you are looking at best at a 2.5Gb/s speed.
Any idea why ethernet stagnated in terms of speed? There was a time it was so much faster compared to usb. Now even wifi seems to be faster. Sure one can buy nice ethernet cards and cables, but the reality is that if you grab a random laptop/desktop from best buy and a cable, you are looking at best at a 2.5Gb/s speed.
Wireless happened, I'd think. People started using wifi and cellular data for everything, so applications had to adapt to this lowest common denominator, and consumer broadband demand for faster-than-wifi speeds isn't there. Plus operators put all their money into cellular infra leaving no money to update broadband infra.
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Yep, these cards need a fan (or any kind of directed air flow). Where did you get "several ms of latency" figure from? I have not measured external card, but may be I should do it... Because cards themselves have latency in range of microseconds, not millis.
I haven't tested this particular Thunderbolt SFP adapter, but my experience with a TP-Link 1Gbps USB adapter is that it adds about 4ms of latency. Far from being unusable and similar to WiFi perhaps, but worse than PCIe cards that should be <1ms.
there are a lot of usb options that matter, and tp-link ships lots of realtek chipsets that require very special driver incantations that a lot of the linux drivers simply don't replicate.
two+ layers of bad options will surely add 4ms quick.
This is an outstanding blog post. Initially, the title did little to captivate me, but the blog post was so well written that I got nerd-sniped. Who knew this little adapter was so fascinating! I wonder if the manufacturer is buying the Mellanox cards used from data center tear-downs. The author claims they can be had for only 20 USD online. That seems too good to be true! Small thing: I just checked Amazon.com: http…
This is an outstanding blog post. Initially, the title did little to captivate me, but the blog post was so well written that I got nerd-sniped. Who knew this little adapter was so fascinating! I wonder if the manufacturer is buying the Mellanox cards used from data center tear-downs. The author claims they can be had for only 20 USD online. That seems too good to be true! Small thing: I just checked Amazon.com: http…
In my experience, the cheap eBay MLX cards are DellEMC/HPE/etc OEM cards. However I also encountered zero problems cross-flashing those cards back to generic Mellanox firmware. I'm running several of those cross-flashed CX-4 Lx cards going on six or seven years now and they've been totally bulletproof.
Any idea why ethernet stagnated in terms of speed? There was a time it was so much faster compared to usb. Now even wifi seems to be faster. Sure one can buy nice ethernet cards and cables, but the reality is that if you grab a random laptop/desktop from best buy and a cable, you are looking at best at a 2.5Gb/s speed.
For 10 Gbps I find it simpler and cheaper to use fiber or DACs, but motherboards don't provide SFP+, only RJ45 ports. Over 10 Gbps copper is a no go. SFP28 and above would be nice to have on motherboards, but that's a dream with almost zero chances to happen. For most people RJ45 + WiFi 7 is good enough, computer manufacturers will not put SFP+ or SFP28 for a small minority of people.
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I have a cluster of 4 RPi Zero Ws and network reliability is not great. Since it is for the chaos, it’s fine, but it’s very common to have a node be offline at any given time. Even worse, the control plane is exposed, but for something that runs 3 Hercules mainframe emulation and two Altairs with MP/M, it’s fine.
I have a bunch of HA wifi connected sensors, I see them drop off and reconnect all the time it is most annoying.
After it happened 3-4 times, I started debugging. It turned out that we usually get at least a bit of sunlight around noon, as it burns away the morning clouds. And my Thunderbolt box was in direct sunlight, and eventually started overheating.
And a Zoom restart made it fall back onto the Wifi connection instead of wired.
I fixed that by adding a small USB-powered fan to the Thunderbolt box as a temporary workaround. I just realized that it's been like this for the last 3 years: https://pics.ealex.net/s/overheat