[rabbitmq-discuss] Over memory threshold?

[yaohui]

When there is plenty of  messages in the queues, the memory would be over a high_watermark that is 1/4 physical memory by default. after write some message to disk, the memory will below the high_watermark.
  but i found that, after it's over the hig_watermark some times, the rabbitmq do nothing though the memory is over the high_watermark. then i can't send any message to rabbitmq. why the message aren't written to disk?
  
 this is a tail of log
=INFO REPORT==== 16-Jun-2011::17:24:08 ===
vm_memory_high_watermark clear. Memory used:429337976 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:24:08 ===
    alarm_handler: {clear,{vm_memory_high_watermark,node1 at test01}}
 =INFO REPORT==== 16-Jun-2011::17:24:09 ===
vm_memory_high_watermark set. Memory used:438883816 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:24:09 ===
    alarm_handler: {set,{{vm_memory_high_watermark,node1 at test01},[]}}
 =INFO REPORT==== 16-Jun-2011::17:24:58 ===
vm_memory_high_watermark clear. Memory used:421535520 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:24:58 ===
    alarm_handler: {clear,{vm_memory_high_watermark,node1 at test01}}
 =INFO REPORT==== 16-Jun-2011::17:24:59 ===
vm_memory_high_watermark set. Memory used:430383912 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:24:59 ===
    alarm_handler: {set,{{vm_memory_high_watermark,node1 at test01},[]}}
 =INFO REPORT==== 16-Jun-2011::17:25:02 ===
vm_memory_high_watermark clear. Memory used:428755056 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:25:02 ===
    alarm_handler: {clear,{vm_memory_high_watermark,node1 at test01}}
 =INFO REPORT==== 16-Jun-2011::17:25:03 ===
vm_memory_high_watermark set. Memory used:433435224 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:25:03 ===
    alarm_handler: {set,{{vm_memory_high_watermark,node1 at test01},[]}}
 =INFO REPORT==== 16-Jun-2011::17:25:51 ===
vm_memory_high_watermark clear. Memory used:428601928 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:25:51 ===
    alarm_handler: {clear,{vm_memory_high_watermark,node1 at test01}}
 =INFO REPORT==== 16-Jun-2011::17:25:52 ===
vm_memory_high_watermark set. Memory used:436017336 allowed:429496729
 =INFO REPORT==== 16-Jun-2011::17:25:52 ===
    alarm_handler: {set,{{vm_memory_high_watermark,node1 at test01},[]}}
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