Increasing checkpoint_segments - Any bad thing might happen?

I realize that, when I have 1 threads perform frequent read, and another 3 threads to perform frequent write. I will
getthe following error log *sometimes* 

2010-05-07 17:16:10 MYT LOG checkpoints are occurring too frequently (22 seconds apart)
2010-05-07 17:16:10 MYT HINT Consider increasing the configuration parameter "checkpoint_segments".
2010-05-07 17:31:37 MYT LOG checkpoints are occurring too frequently (29 seconds apart)
2010-05-07 17:31:37 MYT HINT Consider increasing the configuration parameter "checkpoint_segments".

My observation is, even the above logging happen, "write" operation is success when I exam the content of database.

What happen is that, the read operation fail.

read thread is spawned after 3 write threads, and read thread will only be considered as "success", only when its read
resultis same as what is being written by the 3 threads. The read threads will perform retry for every 200ms, lasted
for4 seconds. 

I was thinking, what is the consequent of increasing "checkpoint_segments", say, from 3 to 6. Any bad thing might
happen?

Thanks and Regards
Yan Cheng CHEOK