I just upgraded some servers to RHEL7 and saw some really, really bad performance and found ssse_pac to be the badguy. After disabling PAC, the system worked well. Before that, server had a load at 200 with only 3-400 users. This is with sssd 1.11.2. After removing pac, it was down to a calm load of 1.2 or so, similar to that of Samba 3 with winbind. Any ideas what might have cause this?