This patch is not intentended to be merged, it just acts as performance
A/B comparison benchmark for the subsequent patch.
Signed-off-by: Christian Schoenebeck <qemu_...@crudebyte.com>
---
tests/qtest/virtio-9p-test.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/tests/qtest/virtio-9p-test.c b/tests/qtest/virtio-9p-test.c
index 41fed41de1..2cd9e427b4 100644
--- a/tests/qtest/virtio-9p-test.c
+++ b/tests/qtest/virtio-9p-test.c
@@ -20,6 +20,18 @@
#include "libqos/virtio-9p.h"
#include "libqos/qgraph.h"
+/*
+ * to benchmark the real time (not CPU time) that elapsed between start of
+ * a request and arrival of its response
+ */
+static double wall_time(void)
+{
+ struct timeval t;
+ struct timezone tz;
+ gettimeofday(&t, &tz);
+ return t.tv_sec + t.tv_usec * 0.000001;
+}
+
#define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)
static QGuestAllocator *alloc;
@@ -646,12 +658,30 @@ static void fs_walk(void *obj, void *data,
QGuestAllocator *t_alloc)
}
do_attach(v9p);
+ const double start = wall_time();
req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
+ const double twalk = wall_time();
v9fs_req_wait_for_reply(req, NULL);
+ const double waitforreply = wall_time();
v9fs_rwalk(req, &nwqid, &wqid);
+ const double end = wall_time();
g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
+ printf("\nTime client spent on sending Twalk: %fs\n\n",
+ twalk - start);
+
+ printf("Time client spent for waiting for reply from server: %fs "
+ "[MOST IMPORTANT]\n", waitforreply - start);
+ printf("(This is the most important value, because it reflects the time\n"
+ "the 9p server required to process and return the result of the\n"
+ "Twalk request.)\n\n");
+
+ printf("Total client time: %fs\n", end - start);
+
+ //printf("Details of response message data: R_readddir nentries=%d "
+ // "rbytes=%d\n", nentries, count);
+
for (i = 0; i < P9_MAXWELEM; i++) {
g_free(wnames[i]);
}
--
2.20.1
