Hi,
I tried on linux-4.1:
linux:~# cat /proc/sys/net/ipv4/tcp_mem
8388608 12582912 16777216
linux:~# echo 1234 >/proc/sys/net/ipv4/tcp_mem
-bash: echo: write error: Invalid argument
linux:~# cat /proc/sys/net/ipv4/tcp_mem
1234 12582912 16777216
the echo operation got error, but value already written to tcp_mem.
I checked, patch f594d63199688ad568fb caused the issue.
thanks,
Wang
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