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Re: Yet another base64 patch

From
PDPaul Dickson <paul@permanentmail.com>
Date
Apr 15, 2005, 23:55 UTC
Message-ID
<20050415165532.05ed5dc4.paul@permanentmail.com>
In-Reply-To
<425DEF64.60108@zytor.com>
On Wed, 13 Apr 2005 21:19:48 -0700, H. Peter Anvin wrote:
Show 11 quoted lines
> Checking out the total kernel tree (time checkout-cache -a into an empty 
> directory):
> 
>         Cache cold      Cache hot
> stock   3:46.95         19.95
> base64  5:56.20         23.74
> flat    2:44.13         15.68
> 
> It seems that the flat format, at least on ext3 with dircache, is 
> actually a major performance win, and that the second level loses quite 
> a bit.

Since 160-bits does not go into base64 evenly anyways, what happens if you use 2^10 instead of 2^12 for the subdir names? That will be 1/4 the directories of the base64 given above.

	-Paul
Previous: H. Peter AnvinNext: H. Peter Anvin
Message 33 of 34 in “Yet another base64 patch”
  1. H. Peter AnvinApr 14, 2005
  2. Christopher LiApr 14, 2005
  3. H. Peter AnvinApr 14, 2005
  4. Christopher LiApr 14, 2005
  5. H. Peter AnvinApr 14, 2005
  6. H. Peter AnvinApr 14, 2005
  7. Linus TorvaldsApr 14, 2005
  8. H. Peter AnvinApr 14, 2005
  9. Linus TorvaldsApr 14, 2005
  10. bert hubertApr 14, 2005
  11. H. Peter AnvinApr 14, 2005
  12. bert hubertApr 14, 2005
  13. Linus TorvaldsApr 15, 2005
  14. H. Peter AnvinApr 15, 2005
  15. David LangApr 17, 2005
  16. H. Peter AnvinApr 18, 2005
  17. H. Peter AnvinApr 15, 2005
  18. Paul JacksonApr 15, 2005
  19. David A. WheelerApr 17, 2005
  20. Paul JacksonApr 17, 2005
  21. David A. WheelerApr 17, 2005
  22. Paul JacksonApr 17, 2005
  23. David A. WheelerApr 17, 2005
  24. Petr BaudisApr 17, 2005
  25. David A. WheelerApr 18, 2005
  26. Kevin SmithApr 18, 2005
  27. David A. WheelerApr 18, 2005
  28. Daniel BarkalowApr 17, 2005
  29. David A. WheelerApr 17, 2005
  30. H. Peter AnvinApr 14, 2005
  31. Linus TorvaldsApr 14, 2005
  32. H. Peter AnvinApr 14, 2005
  33. Paul DicksonApr 15, 2005
  34. H. Peter AnvinApr 18, 2005

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