Switch to b2gc as default pattern matcher as it uses less memory and is a little faster.

src/util-mpm-b2gc.c

@@ -64,7 +64,7 @@ static void *b2g_func;
 #define B2GC_PMINLEN_MAX    8
 
 /* align pattern storage to these bytes. 1 disables. */
-#define B2GC_ALIGN_PATTERNS 16
+#define B2GC_ALIGN_PATTERNS 2
 
 void B2gcInitCtx (MpmCtx *, int);
 void B2gcThreadInitCtx(MpmCtx *, MpmThreadCtx *, uint32_t);

suricata.yaml

@@ -133,7 +133,7 @@ cuda:
 # compiled with --enable-cuda: b2g_cuda. Make sure to update your
 # max-pending-packets setting above as well if you use b2g_cuda.
 
-mpm-algo: b2g
+mpm-algo: b2gc
 
 # The memory settings for hash size of these algorithms can vary from lowest
 # (2048) - low (4096) - medium (8192) - high (16384) - highest (32768) - max