On 09/14/15 20:35, Adrian Chadd wrote:
Hi,
So what's the actual behaviour of the new tso logic before and after
the above change in tsomax?
Hi,
The behaviour is the same, only the limits have changed a bit.
> like, what are the actual packet sizes
being sent up to the hardware?
It is not about the packet sizes, it is about the number of packets we
transmit per TSO block.
Is TSO or the TCP stack so fragile that
a slight change in how packets are broken up results in ridiculously
less throughput? It's only a few bytes.
Network adapters which support TSO typically has a hard limit on the
number of mbufs it can load. When we exceed this limit, m_defrag() or
packet drop is next. It is the responsibility of the TCP stack to
generated mbuf chains which are within the network adapter given limits.
Previously only the length was accounted for. Now we also account for
the number of segments, because there are many ways a 64K bytes long
mbuf chain can be generated.
--HPS
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