- E3 = Single socket servers (1 processor)
- E5 = Single to quad socket servers (1, 2, 4 processors)
- E7 = Dual, Quad and 8-socket servers (2,4,8 processors)
E3 (Ivy Bridge)
- Old series of E3's were (Sandy Bridge)
- New E3 Series (Ivy Bridge) 1200 series
- E3-1280 more or less equals the Core i7-3770K model
- i7-3770K ~ $332
- E3-1280 ~ $612
- 4 additional PCI express lanes
- Models ending with a 5 have integrated graphics
High: 1290v2 3.7GHz Mid : 1240v2 3.4GHz low : 1220v2 3.1GHz
- RAM: E3 line supports Unbuffered ECC(RECOMMENDED), or NON-ECC DDR3
- Supports up to 32GB in 4 slots.
E5 (Ivy Bridge)
- Single socket based
- Two socket based
---20MB cache Highest: Xeon E5-2690 Low end High: Xeon E5-2650 ---15MB cache Mid: Xeon E5-2630 ---10MB cache Low: Xeon E5-2603
- Quad socket based
---20MB cache Highest: E5-4650 ---16MB cache Mid : E5-4620 ---10MB cache Low : E5-4603
The scheduler is responsible for keeping the CPUs in the system busy. The Linux scheduler implements a number of scheduling policies, which determine when and for how long a thread runs on a particular CPU core.
Scheduling policies are divided into two major categories:
- Realtime threads are scheduled first, and normal threads are scheduled after all realtime threads have been scheduled.
- The realtime policies are used for time-critical tasks that must complete without interruptions.