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Can someone please explain how to apply a patch file to ubuntu server kernel? I'm trying to apply this patch file which enables the tcp_collapse_max_bytes option in the TCP communication options on an ubuntu server. I followed this answer and tried to apply the .patch but got the same error.

Here are my steps: first, I changed the directory to the kernel source folder:

cd /usr/src/linux-headers-5.15.0-58-generic

Then I run the command patch -p0 ~/file.patch

But I got the following info and it keeps asking me to enter the file to patch

can't find file to patch at input line 44
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
...
...
File to patch:

I think I am working in wrong directory but I am not sure.

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I found that I have to download the source code and patch the downloaded source code. For some reason that I don't know exactly, the codes in /usr/src/ were not the exact code of the official Linux. (Probably my VPS provider modified them). I followed these steps and applied the patch after downloading the codes, then compiled the kernel and installed it.

So, the following steps helped me:

  1. Download the corresponding linux kernel source code, from official websites such as kernel.org

  2. Extract the kernel and change the directory, i.e. cd linux-5.15.**

  3. Apply the patch patch -p1 < path/to/patch/0014-add-a-sysctl-to-enable-disable-tcp_collapse-logic.patch

  4. Compile the patched kernel and install it. This step may be slightly different based on the distributions, and also requires some dependencies. but usually involves the following commands :

make menuconfig

make

Note that step 4 may be different based on the linux distribution and may require installing some other packages to compile and install the kernel.

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  • I've added more Information. Commented Feb 19, 2023 at 8:58
  • Excellent, mate :-) I deleted my comment. Commented Feb 19, 2023 at 13:39

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