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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-08-19 15:19:30 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2016-08-24 16:04:48 +0300
commit39457acda9139bb078d1b8f974651a194a397060 (patch)
tree0cca90b5a8f3a511d3edbc01f691ff5a168e3571 /crypto
parented0bd721c9322e8e6ee953884706080d40106a6e (diff)
downloadlinux-39457acda9139bb078d1b8f974651a194a397060.tar.xz
crypto: xor - skip speed test if the xor function is selected automatically
If the architecture selected the xor function with XOR_SELECT_TEMPLATE the speed result of the do_xor_speed benchmark is of limited value. The speed measurement increases the bootup time a little, which can makes a difference for kernels used in container like virtual machines. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/xor.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/crypto/xor.c b/crypto/xor.c
index 35d6b3adf230..b8975d92cd94 100644
--- a/crypto/xor.c
+++ b/crypto/xor.c
@@ -109,6 +109,18 @@ calibrate_xor_blocks(void)
void *b1, *b2;
struct xor_block_template *f, *fastest;
+ fastest = NULL;
+
+#ifdef XOR_SELECT_TEMPLATE
+ fastest = XOR_SELECT_TEMPLATE(fastest);
+ if (fastest) {
+ printk(KERN_INFO "xor: automatically using best "
+ "checksumming function %-10s\n",
+ fastest->name);
+ goto out;
+ }
+#endif
+
/*
* Note: Since the memory is not actually used for _anything_ but to
* test the XOR speed, we don't really want kmemcheck to warn about
@@ -126,36 +138,22 @@ calibrate_xor_blocks(void)
* all the possible functions, just test the best one
*/
- fastest = NULL;
-
-#ifdef XOR_SELECT_TEMPLATE
- fastest = XOR_SELECT_TEMPLATE(fastest);
-#endif
-
#define xor_speed(templ) do_xor_speed((templ), b1, b2)
- if (fastest) {
- printk(KERN_INFO "xor: automatically using best "
- "checksumming function:\n");
- xor_speed(fastest);
- goto out;
- } else {
- printk(KERN_INFO "xor: measuring software checksum speed\n");
- XOR_TRY_TEMPLATES;
- fastest = template_list;
- for (f = fastest; f; f = f->next)
- if (f->speed > fastest->speed)
- fastest = f;
- }
+ printk(KERN_INFO "xor: measuring software checksum speed\n");
+ XOR_TRY_TEMPLATES;
+ fastest = template_list;
+ for (f = fastest; f; f = f->next)
+ if (f->speed > fastest->speed)
+ fastest = f;
printk(KERN_INFO "xor: using function: %s (%d.%03d MB/sec)\n",
fastest->name, fastest->speed / 1000, fastest->speed % 1000);
#undef xor_speed
- out:
free_pages((unsigned long)b1, 2);
-
+out:
active_template = fastest;
return 0;
}