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Diffstat (limited to 'tools/testing/selftests/net/tcp_mmap.c')
-rw-r--r--tools/testing/selftests/net/tcp_mmap.c42
1 files changed, 35 insertions, 7 deletions
diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c
index a61b7b3da549..00f837c9bc6c 100644
--- a/tools/testing/selftests/net/tcp_mmap.c
+++ b/tools/testing/selftests/net/tcp_mmap.c
@@ -123,6 +123,28 @@ void hash_zone(void *zone, unsigned int length)
#define ALIGN_UP(x, align_to) (((x) + ((align_to)-1)) & ~((align_to)-1))
#define ALIGN_PTR_UP(p, ptr_align_to) ((typeof(p))ALIGN_UP((unsigned long)(p), ptr_align_to))
+
+static void *mmap_large_buffer(size_t need, size_t *allocated)
+{
+ void *buffer;
+ size_t sz;
+
+ /* Attempt to use huge pages if possible. */
+ sz = ALIGN_UP(need, map_align);
+ buffer = mmap(NULL, sz, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0);
+
+ if (buffer == (void *)-1) {
+ sz = need;
+ buffer = mmap(NULL, sz, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if (buffer != (void *)-1)
+ fprintf(stderr, "MAP_HUGETLB attempt failed, look at /sys/kernel/mm/hugepages for optimal performance\n");
+ }
+ *allocated = sz;
+ return buffer;
+}
+
void *child_thread(void *arg)
{
unsigned long total_mmap = 0, total = 0;
@@ -135,6 +157,7 @@ void *child_thread(void *arg)
void *addr = NULL;
double throughput;
struct rusage ru;
+ size_t buffer_sz;
int lu, fd;
fd = (int)(unsigned long)arg;
@@ -142,9 +165,9 @@ void *child_thread(void *arg)
gettimeofday(&t0, NULL);
fcntl(fd, F_SETFL, O_NDELAY);
- buffer = malloc(chunk_size);
- if (!buffer) {
- perror("malloc");
+ buffer = mmap_large_buffer(chunk_size, &buffer_sz);
+ if (buffer == (void *)-1) {
+ perror("mmap");
goto error;
}
if (zflg) {
@@ -179,6 +202,10 @@ void *child_thread(void *arg)
total_mmap += zc.length;
if (xflg)
hash_zone(addr, zc.length);
+ /* It is more efficient to unmap the pages right now,
+ * instead of doing this in next TCP_ZEROCOPY_RECEIVE.
+ */
+ madvise(addr, zc.length, MADV_DONTNEED);
total += zc.length;
}
if (zc.recv_skip_hint) {
@@ -230,7 +257,7 @@ end:
ru.ru_nvcsw);
}
error:
- free(buffer);
+ munmap(buffer, buffer_sz);
close(fd);
if (zflg)
munmap(raddr, chunk_size + map_align);
@@ -347,6 +374,7 @@ int main(int argc, char *argv[])
uint64_t total = 0;
char *host = NULL;
int fd, c, on = 1;
+ size_t buffer_sz;
char *buffer;
int sflg = 0;
int mss = 0;
@@ -437,8 +465,8 @@ int main(int argc, char *argv[])
}
do_accept(fdlisten);
}
- buffer = mmap(NULL, chunk_size, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ buffer = mmap_large_buffer(chunk_size, &buffer_sz);
if (buffer == (char *)-1) {
perror("mmap");
exit(1);
@@ -484,6 +512,6 @@ int main(int argc, char *argv[])
total += wr;
}
close(fd);
- munmap(buffer, chunk_size);
+ munmap(buffer, buffer_sz);
return 0;
}