Byte Queue Limits: the unauthorized biography
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Re: Byte Queue Limits: the unauthorized biography
#2What kernel versions is this available? How do you check if it's enabled?
Are you likely to get it automatically if you run a recent stock Debian / Ubuntu / Alpine / Arch / Mint / whatever? Or do you have to do something specific to enable it?
> it does require driver changes which is a bit of a pain. By my count it is supported by more than fifty drivers
How do you check? Can you give an example of where the code's different in a driver that supports it and a driver that doesn't? It might be nice to have a Python script to analyze the kernel source tree and produce a list of which drivers support BQL, it might affect my purchasing decisions if I'm building a system I expect to have heavy network loads (media server / NAS or the like).
Re: Byte Queue Limits: the unauthorized biography
#3What kernel versions is this available? How do you check if it's enabled? Are you likely to get it automatically if you run a recent stock Debian / Ubuntu / Alpine / Arch / Mint / whatever? Or do you have to do something specific to enable it? > it does require driver changes which is a bit of a pain. By my count it is supported by more than fifty drivers How do you check? Can you give an example of where the code's…
As the article states, BQL has been around since 2011 so it's most likely available - you can grep for CONFIG_BQL in your /boot/config-* file to confirm.
I'm not aware of any up-to-date list of drivers that support BQL. You could try something like [1], but I'm not sure if it will find all relevant drivers.
[1] https://livegrep.com/search/linux?q=file%3A%5C.c%24%20netdev...