update readme.

@@ -711,21 +711,21 @@ Performance benchmark history, on virtual box.
 
 ### Play benchmark
 
-The play benchmark by st-load:
+The play benchmark by [st-load](https://github.com/winlinvip/st-load):
 
-* 2013-11-28, SRS 0.5.0,   1.8k(1800)clients, 90%CPU, 41MB. [benchmark](https://github.com/winlinvip/simple-rtmp-server/commit/023e23bc8261bec15a70a7ae932098fb4f82b679)
-* 2014-07-12, SRS 0.9.156, 1.8k(1800)clients, 68%CPU, 38MB. [benchmark](https://github.com/winlinvip/simple-rtmp-server/commit/e2d273f4939348374bf9644df9d54c4293b39c1a)
-* 2014-07-12, SRS 0.9.156, 2.7k(2700)clients, 89%CPU, 61MB. [benchmark](https://github.com/winlinvip/simple-rtmp-server/commit/6d12280b7cc54c465b1caf8b1402149e77c4c7d9)
+* 2013-11-28, SRS 0.5.0,   1.8k(1800)clients, 90%CPU, 41MB.
+* 2014-07-12, SRS 0.9.156, 1.8k(1800)clients, 68%CPU, 38MB.
+* 2014-07-12, SRS 0.9.156, 2.7k(2700)clients, 89%CPU, 61MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/1ae3e6c64cc5cee90e6050c26968ebc3c18281be)
 * 2014-11-11, SRS 1.0.5,   2.7k(2700)clients, 85%CPU, 66MB. 
 * 2014-11-11, SRS 2.0.12,  2.7k(2700)clients, 85%CPU, 66MB.
 * 2014-11-12, SRS 2.0.14,  2.7k(2700)clients, 69%CPU, 59MB.
-* 2014-11-12, SRS 2.0.14,  3.5k(3500)clients, 95%CPU, 78MB.
-* 2014-11-13, SRS 2.0.15,  6.0k(6000)clients, 82%CPU, 203MB.
+* 2014-11-12, SRS 2.0.14,  3.5k(3500)clients, 95%CPU, 78MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/8acd143a7a152885b815999162660fd4e7a3f247)
+* 2014-11-13, SRS 2.0.15,  6.0k(6000)clients, 82%CPU, 203MB. [commit](https://github.com/winlinvip/simple-rtmp-server/commit/cc6aca9ad55342a06440ce7f3b38453776b2b2d1)
 * 2014-11-22, SRS 2.0.30,  7.5k(7500)clients, 87%CPU, 320MB.
 
 ### Publish benchmark
 
-The publish benchmark by st-load:
+The publish benchmark by [st-load](https://github.com/winlinvip/st-load):
 
 * 2014-12-03, SRS 1.0.10,  1k(1000) publishers, xx%CPU, xxMB.