On Sat, 2014-02-08 at 05:33 -0800, Eric Dumazet wrote:
> On Sat, 2014-02-08 at 05:14 -0800, Eric Dumazet wrote:
> > Here is the combined patch, could you test it ?
>
> Also make sure you have commit a181ceb501b31b4bf8812a5c84c716cc31d82c2d
> ("tcp: autocork should not hold first packet in write queue")
> in your tree.
>
>
BTW this problem demonstrates there is room for improvement in iCSCI,
using MSG_MORE to avoid sending two small segments in separate frames.
[1] 00:32:35.726568 IP 10.101.99.5.3260 > 10.101.0.13.27778: Flags [P.], seq
145:193, ack 144, win 235, options [nop,nop,TS val 4294960733 ecr 385385],
length 48
[2] 00:32:35.838074 IP 10.101.0.13.27778 > 10.101.99.5.3260: Flags [.], ack
193, win 514, options [nop,nop,TS val 385396 ecr 4294960733], length 0
[3] 00:32:35.838099 IP 10.101.99.5.3260 > 10.101.0.13.27778: Flags [P.], seq
193:705, ack 144, win 235, options [nop,nop,TS val 4294960761 ecr 385396],
length 512
[1] & [3] could be coalesced, and [2] would be avoided.
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