In order to support Debian/Bullseye, we know require minimal kernel v…

…ersion - 5.10

README.md

@@ -16,8 +16,8 @@ TODO.
 ## Running the server
 
 Dragonfly runs on linux. It uses relatively new linux specific [io-uring API](https://github.com/axboe/liburing)
-for I/O, hence it requires Linux version 5.11 or later.
-Ubuntu 20.04.4 or 22.04 fit these requirements.
+for I/O, hence it requires Linux version 5.10 or later.
+Debian/Bullseye, Ubuntu 20.04.4 or later fit these requirements.
 
 
 ### With docker:
@@ -26,10 +26,10 @@ Ubuntu 20.04.4 or 22.04 fit these requirements.
 docker pull ghcr.io/dragonflydb/dragonfly:latest && \
 docker tag ghcr.io/dragonflydb/dragonfly:latest dragonfly
 
-docker run --network=host --rm dragonfly
+docker run --network=host --ulimit memlock=-1 --rm dragonfly
 ```
 
-Some hosts may require adding `--ulimit memlock=-1` to `docker run` options.
+*You need `--ulimit memlock=-1` because some Linux distros configure the default memlock limit for containers as 64m and Dragonfly requires more.*
 
 ### Building from source
 
@@ -46,7 +46,7 @@ sudo apt install ninja-build libunwind-dev libboost-fiber-dev libssl-dev \
 ./helio/blaze.sh -release
 
 # Build
-cd build-opt && ninja dragonfly  
+cd build-opt && ninja dragonfly
 
 # Run
 ./dragonfly --alsologtostderr

src/server/dfly_main.cc

@@ -83,8 +83,8 @@ int main(int argc, char* argv[]) {
   base::sys::KernelVersion kver;
   base::sys::GetKernelVersion(&kver);
 
-  if (kver.major < 5 || (kver.major == 5 && kver.minor < 11)) {
-    LOG(ERROR) << "Kernel 5.11 or later is supported. Exiting...";
+  if (kver.kernel < 5 || (kver.kernel == 5 && kver.major < 10)) {
+    LOG(ERROR) << "Kernel 5.10 or later is supported. Exiting...";
     return 1;
   }
 
@@ -93,8 +93,8 @@ int main(int argc, char* argv[]) {
     return 1;
   }
 
-  CHECK_LT(kver.minor, 99u);
-  dfly::kernel_version = kver.major * 100 + kver.minor;
+  CHECK_LT(kver.major, 99u);
+  dfly::kernel_version = kver.kernel * 100 + kver.major;
 
   if (FLAGS_maxmemory == 0) {
     LOG(INFO) << "maxmemory has not been specified. Deciding myself....";