Hi, first of all, please CC me on any reply, as I am only subscribed to the digest. OK. Here is the problem. Said kernel (from 4.4) seems to have problems with file-locking when the system is under high, likely network related, load. The symptoms are things using file locking (rpm, the user-space automounter amd) fail to obtain locks, usually stating timeout problems. The sytem in question is a HP/DL380G4 with dual-single-core EM64T CPUs and 8GB of Memory. The network interfaces are "tg3". It happens with both CentOs and RHEL4. The high load can be triggered by copying three 3 GB files in parallel from an NFS server (Solaris10, NFS, TCP, 1GBit) to another NFS server (RHEL4, NFS, TCP, 100 MBit). The measured network performance is OK. During this operation the systems goes to Loads around/above 10. Overall responsiveness feels good, but software doing file-locking or stuff like opening a new ssh connection take extremely long. So, if anyone has an idea or hint, it will be highly appreciated. Cheers Martin ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de