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Revert TCP_SND/RCVSPACE sizes to 8KB

Dmitry Osipenko requested to merge digetx/libslirp:tcp-space-fix into master

Network performance regressed by 6 times in QEMU due to changed sizes of TCP_SND/RCVSPACE. Booting kernel with NFS rootfs takes 60sec, while it should be 8sec normally. Revert TCP_SND/RCVSPACE sizes to 8KB in order to fix the regression.

Fixes: 09d410ad ("allow custom MTU") Signed-off-by: Dmitry Osipenko digetx@gmail.com

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