Optimize ipc writev

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #3994 (0e72deb) into master (36a1dc2) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3994      +/-   ##
==========================================
+ Coverage   48.93%   48.97%   +0.03%     
==========================================
  Files          69       69              
  Lines       12971    12977       +6     
==========================================
+ Hits         6348     6356       +8     
+ Misses       6623     6621       -2     

Impacted Files	Coverage Δ
src/memory/buffer.cc	91.02% <100.00%> (+0.35%)	⬆️
src/server/process.cc	53.74% <100.00%> (+0.61%)	⬆️
src/server/port.cc	53.74% <0.00%> (-0.33%)	⬇️
src/protocol/base.cc	66.66% <0.00%> (+2.04%)	⬆️

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