When it comes to comparing network/embedded CPUs, there is more than
just MHz that needs to be considered. Some CPUs have multiple cores,
hardware accelerators, etc. For example, we use a Gemini SL3512 CPU in
some of our products. Here are some of the accelerators that it has:
-Layer2/3/4 hardware switching, routing and NAT with 4 transmit queues
per port for QoS support
-Layer2-7 packet classification into 16 receive queues
-Transmit acceleration by TCP segmentation, IP fragmentation and
TCP/IP/UDP checksum calculation
-Receive acceleration by TCP connection table lookup, assembly of
multiple packets belonging to the same TCP connection and TCP/IP/UDP
checksum verification
-Hardware Security Acceleration Engine performs DES, 3DES, AES, CCMP and
RC4 encryption/decryption with CBC or ECB mode operation; authentication
with SHA1, MD5, HMAC-SHA1 and HMAC-MD5 hashing algorithm
All of these functions are then offloaded from the main CPU which can
perform other functions. Just the first one (hardware NAT accelerator)
can increase NAT throughput by an order of magnitude.
-Hal
Ligowave
-----Original Message-----
From: Bo Ring <[EMAIL PROTECTED]>
Reply-To: WISPA General List <wireless@wispa.org>
To: WISPA General List <wireless@wispa.org>
Subject: Re: [WISPA] RB532 and 40MBps
Date: Tue, 15 Jul 2008 21:54:00 -0500
> Question is.... Why does teh 600 series outperform them all, when it
> has the
> slowest processor in MHZ?
>
> Are Mikrotik's 532a speeds test at 266 or 400Mhz? And the 600 series
> at 200
> or 400? They did specify on their report.
>
> Is the 600's Power PC's processor really that much better that it
> gets so
> much better speed at slower Mhz?
While I can not speak of it in use between these two routers, there is
a reason why it was logical to move to RISC. They are more efficient
chips and tend to be even more so when they are used in specific
environments. If anyone is a Mac head from way back, you might
remember the raw numbers between the 40MHz 68030 and the 25MHz PowerPC
when Apple first moved to them.
Bo Ring
Account Manager
[EMAIL PROTECTED]
cell: 630-743-1162 • office: 312-205-2515
16W235 83rd Street, Suite A, Burr Ridge, IL 60527 • tel: 773.667.4585
fax: 773.326.4641
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