Comparing Latency on Emulex and QLogic HBA Driver
The blog post describes the implementation differences between Emulex and HBA drivers which are relevant for latency. Continue Reading
Solaris
DTrace: Tracing Specific Kernel Threads
The blog post explains how to trace threads based on the first procedure on the stack. Continue Reading
ZFS ARC Resizing (user_reserve_hint_pct)
New kernel parameter user_reserve_hint_pct for limiting the size of ZFS ARC cache causes frequent shrinks which, in turn, gives rise to CPU cross-call storms. Continue Reading
Emulex HBA Driver Performance Analysis (3) – Measuring Overhead
The blog post describes how to measure elapsed time in the Emulex HBA driver. Continue Reading
Emulex HBA Driver Performance Analysis (2) – Packet Flow
The blog post describes how to explore the SCSI packet flow through different processing stages in the Emulex HBA driver. Continue Reading
Emulex HBA Driver Performance Analysis (1) – Measuring Latency
The blog post describes how to measure latency on Emulex HBA driver. Continue Reading