Quick Reference Guide

Quality of Service (QoS) Commands | 367
Mode
Interface Config
Command
History
Buffer Carving
The commands in this section are:
• buffer dedicated (1G and stacking ports) on page 368
• buffer dedicated interface (10G ports) on page 369
• buffer dynamic (1G and stack ports) on page 370
• buffer dynamic interface (S25P) on page 372
• buffer dynamic interface system-downlink on page 372
• buffer packets interface on page 373
Buffer carving (also called buffer tuning, which is manual allocation of the memory in the switch
ASICs) is new in SFTOS 2.5.1. It enables the S-Series user to override the settings of the hardware
dynamic and static buffers (also called dedicated buffers or fixed buffers) on a per-port and a
per-queue, per-port basis. Configuration is allowed for all physical ports — 1G, 10G, and stack ports.
Hardware memory in the S-Series is, by default, allocated primarily to dynamic buffers, which
provides for maximum flexibility in supporting all traffic. You can use the buffer carving commands to
reallocate more of that memory on certain ports to static buffers, enabling you to give higher priority to
traffic on those ports. Buffer carving is especially useful to users who know their applications well and
want to use S-Series switches in places where bursty traffic is common and well understood.
buffer check
This command checks the hardware to verify that the configured buffer allocations meet the hardware
requirements.
Syntax
buffer check
Version 2.5 Replaced, in part, by dot1p-priority, for port channel ports.
Caution: Changing the buffer settings from their defaults can yield unpredictable
results, because Dell Force10 has not tested the many combinations of possible
values and port configurations. If you are using these features for the first time,
contact Dell Force10 TAC (Technical Assistance Center) for assistance:
E-mail Direct Support: [e-mail]
Web: www.force10networks.com/support/
Telephone support:
US and Canada customers: 866-965-5800
International customers: 408-965-5800
Note: Buffer carving should be done before other configuration to ensure that no traffic is
running on the stack. Buffer carving involves changing of hardware buffer settings, so a reboot
(reload command) is required for changes to take effect.