HI all,

I have met one problem:

There is one big file(600MB) and it is very hot, it is larger than ` 
ram_cache_cutoff ` setup:
CONFIG proxy.config.cache.ram_cache_cutoff INT 20M


I have noticed that the `rKB/s` on one disk is very high, and the disk usage is 
keeping nearly 100%.

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz 
avgqu-sz   await  svctm  %util
sde               0.00   124.00  196.33    2.33 47210.00   505.33   480.36    
35.17  182.13   5.02  99.73


It seems linux pagecache does NOT work when using ATS, and ATS ram_cache does 
not work either, am I correct?
What is the suggestion value of `proxy.config.cache.ram_cache.size` and 
`proxy.config.cache.ram_cache_cutoff` ?

How should I handle this case?


Thanks in advance.

---
Best Regards,
Thomas

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