Alexander Motin 6895f89fe5 Coalesce socket reads in software iSCSI.
Instead of 2-4 socket reads per PDU this can do as low as one read
per megabyte, dramatically reducing TCP overhead and lock contention.

With this on iSCSI target I can write more than 4GB/s through a
single connection.

MFC after:	1 month
2021-02-22 12:51:59 -05:00
..
2021-01-28 16:22:45 -05:00