Hello everyone!
I run the obfs4 bridge, in the parameters I specify to use iat-modr=2. As a result, the bridge is VERY, VERY SLOW. Connection speed is on average 100 kb/sec. When I remove the iat-mode=2 parameter, the speed becomes 8-10 times higher.
I checked the processor load, it is at 3%, the problem is unlikely to be with the processor, the RAM load is at 20%. I can't figure out if this is expected behavior or if the speed drop is too significant. Please tell me, is this the normal maximum speed of the bridge with iat-mode=2 or can it be increased somehow?
On Tue, Sep 26, 2023 at 02:22:06PM +0000, Split via tor-relays wrote:
I run the obfs4 bridge, in the parameters I specify to use iat-modr=2. As a result, the bridge is VERY, VERY SLOW. Connection speed is on average 100 kb/ sec. When I remove the iat-mode=2 parameter, the speed becomes 8-10 times higher.
I checked the processor load, it is at 3%, the problem is unlikely to be with the processor, the RAM load is at 20%. I can't figure out if this is expected behavior or if the speed drop is too significant. Please tell me, is this the normal maximum speed of the bridge with iat-mode=2 or can it be increased somehow?
I don't know what's a typical bandwidth range to expect, but it's expected that iat-mode=2 is much slower than normal. Use iat-mode=1 for less aggressive traffic shaping.
Some old visualizations of iat-mode's effect on packet sizes and timing: https://www.bamsoftware.com/talks/pets-2017-menace/#figures
This is to be expected, you get 100kB/s with iat-mode=2, and around 256-1024kB/s with iat-mode=1, however since most sites I load are just HTML/CSS with little pictures, it is no big issue.
I would consider taking the speed penalty for more protection (as a research paper also pointed out).
Greetings, George ------- Original Message ------- Split via tor-relays tor-relays@lists.torproject.org schrieb am Dienstag, 26. September 2023 um 4:22 nachm.:
Hello everyone!
I run the obfs4 bridge, in the parameters I specify to use iat-modr=2. As a result, the bridge is VERY, VERY SLOW. Connection speed is on average 100 kb/sec. When I remove the iat-mode=2 parameter, the speed becomes 8-10 times higher.
I checked the processor load, it is at 3%, the problem is unlikely to be with the processor, the RAM load is at 20%. I can't figure out if this is expected behavior or if the speed drop is too significant. Please tell me, is this the normal maximum speed of the bridge with iat-mode=2 or can it be increased somehow?
tor-relays@lists.torproject.org
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David Fifield -
George Hartley -
Split