On 09/12/13 14:47, Markus H wrote:
I don't think microbursts are that much of a problem for us. I at least don't see them impacting the VM host sending a backup to the file server,
That's *exactly* the sort of thing that microbursts tend to impact. The basic problem is: port A sends to port B at 1Gbit/sec port C sends a burst of 10 packets to port B every X seconds port A TCP flow drops, and recovers relatively slowly repeat A->B bulk throughput is a small fraction of the link rate
or even several of us pushing photos/videos from an event we attended onto the owncloud instance. (If anyone however has some nice article that I should read on microbursts feel free to send a link my way.)
There's extensive discussion on this in the list archives, but the basic idea is simple; tiny bursts of traffic, often back-to-back / linerate (e.g. as a result of 10kb of data being send via TSO NIC offload) cause other TCP flows to sawtooth.
They may not be a problem for you - we used the 3750s for years without problems - but don't underestimate how annoying they can be.
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