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Re: Does Subversion enable compression automatically under Apache

From: <DJockheck_at_gauselmann.de>
Date: 2005-03-09 09:08:04 CET

Hi!

I cannot agree! When I make Checkin's or Checkout's I arrive up to 20 MB
per minute. Compression is switched of in apache. I'm using a switched
100MBit-Network, so much faster transfers should be possible. Your
speed-checks would interest me!

regards
Detlef Jockheck

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                                         An:  Moisei <moisei@gmail.com>                                               
                                                                                                                      
                                         Kopie:  users@subversion.tigris.org                                          
                                         Thema:  Re: Does Subversion enable compression automatically under Apache    
                                                                                                                      
                                                                                                                      
                                                                                                                      
           Ben Collins-Sussman                                                                                        
           <sussman@collab.net>                                                                                       
           08.03.2005 22:55                                                                                           
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
                                                                                                                      
(Embedded image moved to file: pic15890.pcx)www         Diese EMail
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On Mar 8, 2005, at 3:40 PM, Moisei wrote:
> Thank you, Mark.
> I do my homework before I post to the list, so indeed I enabled and
> configured
> the mod_deflate with large memory buffer size and high compression
> level.
> Surprisingly, it takes the exactly same time to checkout quite large
> code-base.
> This is why I've asked whether it is already compressed, I just cannot
> find any
> another explanation.
>
90% of of the data travelling over the network is file data.  For
checkouts and commits, Subversion sends all file data as binary diffs,
which are essentially already compressed.  So turning on mod_deflate
isn't likely to decrease the amount of network traffic at all.
If anything, might *increase* the total time, because now there's
double (redundant) compression going on, which takes both client and
server CPU even more.
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Received on Wed Mar 9 09:12:18 2005

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