Re: GPU PCIe link speed

From	Sarunas Burdulis <sarunas@math.dartmouth.edu>
Newsgroups	linux.debian.user
Subject	Re: GPU PCIe link speed
Date	2022-01-24 20:20 +0100
Message-ID	<DJd2G-GS-5@gated-at.bofh.it> (permalink)
References	<DIagy-3uF-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 1/21/22 17:07, Grzesiek wrote:
> Hi there,
> 
> I noticed that all my GPU operate at PCIe 1.1=2.5GHz instead of PCIe 
> 2.0/3.0. Is there any way to force higher speed?
> 
> Hardware details below
> 
> ---===### First system ###===---
> 
> CPU: i7-3770, Linux version 5.15.0-2-amd64
> 
> # dmesg  | grep bandwidth
> [    0.224924] pci 0000:01:00.0: 16.000 Gb/s available PCIe bandwidth, 
> limited by 2.5 GT/s PCIe x8 link at 0000:00:01.0 (capable of 126.016 
> Gb/s with 8.0 GT/s PCIe x16 link)
> 
> # lspci
 > ...
> 01:00.0 VGA compatible controller: NVIDIA Corporation GK110 [GeForce GTX 
> 780] (rev a1)

Link speed might be set dynamically depending on load. You may do 
something like:

watch -n1 'lspci -vv -s 01:00.0 | grep Lnk'

and then find some task to load the GPU.

-- 
Sarunas Burdulis
Systems Administrator, Dartmouth Mathematics
math.dartmouth.edu/~sarunas

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GPU PCIe link speed Grzesiek <pld@sojka.co> - 2022-01-21 23:10 +0100
  Re: GPU PCIe link speed Sarunas Burdulis <sarunas@math.dartmouth.edu> - 2022-01-24 20:20 +0100

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