We have a proxy whose data sender process is most of the time 100% busy.

While getting a strace, we saw a lot of calls like these taking too long to end.

Is this an expected behaviour? What that means?

13:51:54 read(9, "ZBXD\3\36\0\0\0\26\0\0\0x\234\253V*J-.\310\317+NU\262R*.MN"..., 2048) = 43 <8.343763>