Re: Writing DUMPCAP ring buffer file directly to destination

[John Powell <jrp999 () gmail com>]

Hi Guy,

I had seen an eth file in the /tmp directory earlier that had been
increasing in size - I do not see it now so it must have been a user doing
a manual capture.

Thanks for  getting back to me and correcting the error in my
understanding....

My guess is that the issue is strictly with writing the file down to the
disk so I will work on hardware to enhance that.

Hope you have a great day!!

-John

On Thu, Dec 13, 2012 at 2:50 PM, Guy Harris <guy () alum mit edu> wrote:

> On Dec 13, 2012, at 8:51 AM, John Powell <jrp999 () gmail com> wrote:
>
> > I am currently running DUMPCAP as a service to capture packets in a high
> packet throughput environment.
> > The command used is:
> >
> > /usr/local/bin/dumpcap -B 16 -i 2 -f vlan and (not vrrp and not udp port
> 1985 and not ether host 01:00:0c:cc:cc:cc) -g -b filesize:250000 -b
> duration:900 -w /data/eth1.cap
> > I am experiencing disk IO issues.
> >
> > I suspect that part of my disk IO issue is due to copying the rotated
> file from \tmp to \data
>
> Have you seen it copying the file from /tmp to /data?
>
> Or are you just *assuming* it's writing the files to /tmp and copying them
> rather than just writing directory to files in /data?  It would be unwise
> to assume that, given that, in fact, it *doesn't* do that (and *didn't* do
> that in a test I just did); if you're seeing it copy the file, that's a bug.
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