drbd: new configuration parameter c-min-rate
We now track the data rate of locally submitted resync related requests,
and can thus detect non-resync activity on the lower level device.
If the current sync rate is above c-min-rate, and the lower level device
appears to be busy, we throttle the resyncer.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 06dbba4..0b24ded 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -150,5 +150,9 @@
#define DRBD_C_MAX_RATE_MAX (4 << 20)
#define DRBD_C_MAX_RATE_DEF 102400
+#define DRBD_C_MIN_RATE_MIN 0 /* kByte/sec */
+#define DRBD_C_MIN_RATE_MAX (4 << 20)
+#define DRBD_C_MIN_RATE_DEF 4096
+
#undef RANGE
#endif