Hi Martin,
Please take the test with a grain of salt. It originates back from older
releases 1.4 and nfcapd files changed in between.
The test will be most likely removed in 1.6.11. The reason for that is, that
with a decent server today, compression
should be used all the time. Compression was a matter of balance of CPU and
I/O. With slow I/O disk the CPU compressed
faster, with a slow CPU I/O was faster than compression.
If a file is compressed or not can be determined with ./nfdump -v nfcapd.xxxxx
To look at the effect compress/uncompress a file: ./nfdump -j nfcapd.xxxx
and look at the file size afterwards. nfdump uses minilzo which comes with the
code, so no zlib is required.
Hope this explains compression.
- Peter
On 7/23/13 W30 18:39, Martin Brault wrote:
> Hello,
>
> I am just getting familiar with nfdump/nfsen and I can't seem to get
> compression working. The commandline seems to imply it is toggled on;
>
> /usr/local/bin/nfcapd -w -D -p 4441 -u apache -g apache -B 200000 -S 1
> -P /tmp/nfsen/var/run/p4441.pid -z -I rtr11 -l
> /tmp/nfsen/profiles-data/live/rtr1
>
> -z is in the commandline. However when I check the files:
>
> /root/nfsen/nfdump-1.6.10/bin/nftest nfcapd.201307231205
> Common record size is 28
> ALIGN BYTES: 7
> aligned: 3 -> 8
> 100 write cycles, with size 1048392 bytes
> Uncompressed write time: 0.148834s size: 1048392
> Compressed write time : 1.170007s size: 1048404
> Ratio : 1:1.000
> You should run nfcapd without compression
>
>
> Why is the ratio always 1:1?
>
> I am on CentOS6.4. I checked the configure file and it seems to only
> check for zlib if --enable-ftconv is set. Is this normal?
>
> Thanks,
>
> M.
>
>
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