Re: Remove constructor from buffer_head

[Andrew Morton]

On Thu, 3 May 2007 20:08:41 -0700 (PDT) Christoph Lameter <clameter@xxxxxxx> wrote:

> Performance tests show a slight improvements in netperf (not a
> strong case for a performance improvement but removing the
> constructor has definitely no negative impact so why keep
> this around?).
> 
> TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost (127.0.0.1) port 0 AF_INET
> Recv   Send    Send
> Socket Socket  Message  Elapsed
> Size   Size    Size     Time     Throughput
> bytes  bytes   bytes    secs.    10^6bits/sec
> 
> Before:
>  87380  16384  16384    10.01    6026.04
>  87380  16384  16384    10.01    5992.17
>  87380  16384  16384    10.01    6071.23
> 
> After:
>  87380  16384  16384    10.01    6090.20
>  87380  16384  16384    10.01    6078.3
>  87380  16384  16384    10.00    6013.52

How could a filesystem change affect networking performance?

The change looks nice, but I'd microbenchmark it with a write-to-ext2-on-ramdisk
or something like that.
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