1. 

   Colonel ONeill
   Beta Veteran

   Because encryption obviously requires more CPU cycles, and the strength of the cipher would have some sort of correlation with complexity and processing demand, I am wondering if encryption would reduce the effectiveness of a cache. However, it is also possible that the CPU would be spending time waiting for the hard drive anyway, so the burden of encryption would go unnoticed.

   As a side note, I had my only encrypted cache (on an SD card) spontaneously invalidate the entire cache (dropped Cache fill to zero) once during a cache build. This hasn't recurred since, and could simply have been a random occurrence.

   Posted 1 year ago #
2. 

   foxathome
   Beta Veteran

   With or without the encryption, I don't feel/see any difference in speed...

   Posted 1 year ago #
3. 

   Colonel ONeill
   Beta Veteran

   Agreed, although I think in situations where HDD and CPU are both being stressed (i.e. video encoding), then maybe this would play more into a delay as the decryption thread would have to wait for some CPU time before being able to provide a usable cached file.

   Regardless, I haven't seen/found any documentation regarding the encryption protocols and the strength thereof, and I don't worry about someone finding my cache SD card, so encryption stays off for me just for added speed (even if negligible under most conditions).

   Posted 1 year ago #
4. 

   flash1000
   Member

   I had the same thought with Colonel ONeill. So I have tested the difference in speed between build 547 and 551, and the results are below:
   (The speed of Build 553 in the parentheses were measured under different PC configurations; therefore those are not good samples to compare with.)

   [PC Spec.]
   Win XP Home SP3
   Intel Core2Quad Q6600
   Corsair DDR2 PC6400 2GB x 2 ea (3GB of RAM identified)
   ASUS P5B Mother Board
   Seagate SATA II HDD 250 GB (No RAID)
   USB Thumb Drive, Team Fusion 4GB (Assign 4GB for cache)

   [XP Cold Boot Time]
   I measured the cold boot-up time by manually using chronograph; from the time PC is powered up until the HDD access is stopped (all start up applications are loaded and HDD access LED is kept off for more than 5 seconds).

   Build Time
   eBoostr disabled 2 min 23 s
   547 2 min 01 s
   551 w/o Encryption 2 min 01 s
   551 w/ Encryption 2 min 09 s
   (553 w/o Encryption 2 min 10 s)

   [Applications in Priority List]

   Build FireFox 3.5 OpenOffice 3.0
   eBoostr disabled 8.45 s 9.10s
   547 7.92 s 3.67s
   551 w/o Encryption 6.20 s 2.01s
   551 w/ Encryption 7.20 s 2.20s
   (553 w/o Encryption 8.36 s 2.77s)

   Personally, I did not feel the difference. However, my test resulted that eBoostr with encrypted cache was slightly slower than the one without encryption.

   Posted 1 year ago #

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