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Jayshree Ullal, 2014

Balanced Buffer Design for Mission-Critical Cloud Networks

Leading customers and researchers in cloud and data center networking have been promoting the importance of understanding the impact of TCP/IP flow and congestion control, speed mismatch and adequate buffering for many decades. The problem space has not changed during this time, but the increase in the rates of speed by 100X and in storage capacity by 1000X have aggravated the problem of reliable performance under load for data intensive content and for storage applications, in particular. One Arista fan summed it up best by saying:

“Basically the numbers have changed by order of magnitude, but the problem is the same!”

Poor performance and inadequate buffering in a demanding network is a painful reminder that buffering, flow control, and congestion management must be properly designed. TCP/IP was not inherently built for rate-fairness, and packets are intentionally dropped (yes, only window fairness is possible). Yet the effect of these drops can be multiplicative given major speed mismatches of 10-100X inside the data center. In the past, QoS and rate metering were adequate. However, at multi-gigabit and terabit speeds and particularly as more storage moves from Fiber Channel (with buffer credits) to Ethernet, packet loss gets more acute.

Jayshree Ullal
By Jayshree Ullal
on Aug 12, 2014 12:00:13 AM
   
Balanced Buffer Design for Mission-Critical Cloud Networks

Leading customers and researchers in cloud and data center networking have been promoting the importance of understanding...

Jayshree Ullal
By Jayshree Ullal
on Aug 12, 2014 12:00:13 AM
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Jayshree Ullal
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These days there is much discussion on “disaggregation” of switches or routers – the splitting of the hardware from the...

Jayshree Ullal
By Jayshree Ullal
on Jun 30, 2013 8:04:47 PM
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The rapid adoption in data centers of virtualized servers powered by multicore CPUs, the deployment of petabytes of storage...

Jayshree Ullal
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Opinions expressed here are the personal opinions of the original authors, not of Arista Networks. The content is provided for informational purposes only and is not meant to be an endorsement or representation by Arista Networks or any other party.
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