Date: Thu, 14 Aug 2014 14:35:59 -0400 From: John Baldwin <jhb@freebsd.org> To: arch@freebsd.org Subject: Bumping cpuset_t size and MAXCPU on amd64 to 256 Message-ID: <201408141435.59323.jhb@freebsd.org>
next in thread | raw e-mail | index | archive | help
There was an earlier thread about this a few months ago and after fixing a few other places (already committed) the patch below has survived a universe build. Does anyone have any objections to these going in? Note that the _cpuset.h change changes the size of 'cpuset_t' in userland for all platforms. Due to the way the cpuset system calls work (and the libc routines), this should not be an ABI change (the caller always encodes the size of the set as an argument to the system call). Also, note that on amd64 the kernel won't actually handle more than 255 CPUs (a few places still use u_char which Adrian is preparing to beat into submission, but we also can't support APIC IDs > 0xfe until we grow true x2APIC support). Index: sys/amd64/include/param.h =================================================================== --- sys/amd64/include/param.h (revision 269991) +++ sys/amd64/include/param.h (working copy) @@ -65,7 +65,7 @@ #if defined(SMP) || defined(KLD_MODULE) #ifndef MAXCPU -#define MAXCPU 64 +#define MAXCPU 256 #endif #else #define MAXCPU 1 Index: sys/sys/_cpuset.h =================================================================== --- sys/sys/_cpuset.h (revision 269991) +++ sys/sys/_cpuset.h (working copy) @@ -38,7 +38,7 @@ #define CPU_SETSIZE MAXCPU #endif -#define CPU_MAXSIZE 128 +#define CPU_MAXSIZE 256 #ifndef CPU_SETSIZE #define CPU_SETSIZE CPU_MAXSIZE -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201408141435.59323.jhb>