Increase default IO timeout from 10ms to 5s

With the recent changes to the main loop, we no longer have unconditional polling. This means we can now sleep in select() for much longer than we previously did. This patch increases our select() sleep time from 10ms to 5s which is effectively unlimited since we're going to wake up sooner than that in almost all circumstances. With this patch, I see the number of wake-ups with an idle dynamic ticks guest drop from 80 per second to about 15 times per second. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5578 c046a42c-6fe2-441c-8c8c-71466251a162

Increase default IO timeout from 10ms to 5s
With the recent changes to the main loop, we no longer have unconditional polling. This means we can now sleep in select() for much longer than we previously did. This patch increases our select() sleep time from 10ms to 5s which is effectively unlimited since we're going to wake up sooner than that in almost all circumstances. With this patch, I see the number of wake-ups with an idle dynamic ticks guest drop from 80 per second to about 15 times per second. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5578 c046a42c-6fe2-441c-8c8c-71466251a162
aliguori
1 parent 56f3a5d0
Showing 1 changed file with 2 additions and 2 deletions
vl.c
@@ -8182,7 +8182,7 @@ static int main_loop(void)
                             timeout = 0;
                     }
                 } else {
-                    timeout = 10;
+                    timeout = 5000;
                 }
             } else {
                 timeout = 0;
@@ -8192,7 +8192,7 @@ static int main_loop(void)
                 ret = EXCP_INTERRUPT;
                 break;
             }
-            timeout = 10;
+            timeout = 5000;
         }
 #ifdef CONFIG_PROFILER
         ti = profile_getclock();