[FoRK] Amazon S3 storage service

Eugen Leitl < eugen at leitl.org > on > Thu Mar 16 12:49:35 PST 2006

On Thu, Mar 16, 2006 at 12:32:34PM -0800, J. Andrew Rogers wrote:

> Most current GigE gear supports "jumbo" framing, which gives you up  

10 GigE, too.

> to 9000 bytes, enough to hold an 8192 byte block + network overhead.

Depending on usage pattern (PoE or signalling mesh interconnect)
it might make more sense to use 1 GBit Ethernet, 10 GBit Ethernet,
or InfiniBand and consorts. Arguably for single hard drives GBit
Ethernet with its ~30 us latency and ~100 MBytes/s throughput is
not the bottleneck -- even less so 10 GBit Ethernet.
 
> The "network overhead" can be substantial.  If you use the myriad of  
> advanced features of Ethernet networks and switch fabrics, jumbo  
> frames are almost required for it to work well because 1500 byte  
> frames become too crowded in transit.  An Ethernet network that uses  
> the kitchen sink features will frequently break in annoying ways if  
> the frame size is not kicked up a couple hundred bytes above the  
> standard frame size (e.g. 1700 MTU), which requires jumbo frame support.
> 
> Jumbo framing is well-supported in most recent networking gear, but  
> is not so universal that you can assume it.

Yes, this kinda sucks.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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