Add compatibility support for older intel cpus

[urcu.git] / README

diff --git a/README b/README
index f9437dba2857856b726cc4539b6deeafaf09f668..0f92ac690f1ce884139b18557cea062e893abc80 100644 (file)
--- a/README
+++ b/README
@@ -9,20 +9,22 @@ BUILDING
        make
        make install
 
-       Note:   Forcing 32-bit build:
+       Hints:  Forcing 32-bit build:
                * CFLAGS=-m32 ./configure
 
                Forcing 64-bit build:
                * CFLAGS=-m64 ./configure
 
+               Forcing a 32-bit build with down to 386 compatibility:
+               * CFLAGS=-m32 ./configure --target=i386-pc-linux-gnu
+
 ARCHITECTURES SUPPORTED
 -----------------------
 
-Currently, x86 (only P6+), x86 64, PowerPC 32/64 and S390 are
+Currently, x86 (i386, i486, i586, i686), x86 64, PowerPC 32/64 and S390 are
 supported. The current use of sys_futex() makes it Linux-dependent, although
 this portability limitation might go away in a near future by using the pthread
-cond vars. Also, the restriction against i386, i486 and Pentium might go away if
-we integrate some of glibc runtime CPU-detection tests.
+cond vars.
 
 QUICK START GUIDE
 -----------------
@@ -136,3 +138,13 @@ Usage of DEBUG_YIELD
 
        DEBUG_YIELD is used to add random delays in the code for testing
        purposes.
+
+SMP support
+
+       By default the library is configured to use synchronization primitives
+       adequate for SMP systems. On uniprocessor systems, support for SMP
+       systems can be disabled with:
+
+               ./configure --disable-smp-support
+
+       theoretically yielding slightly better performance.