Re: [Pan-devel] Re: CVS version and download speed

[DPA]

Great find!  Thank you!

On Fri, 2005-10-28 at 21:37 -0700, robert mcdonald wrote:
> The fix: change SECONDS_TO_SLEEP_ON_EAGAIN (found in
> pan/nntp.c) to something lower (I got 150KB/s at the
> default [0.75], I reduced it to 0.1 and got 800+KB/s).
> 
> The explanation: Each time the buffer is exhausted,
> GIOChannel returns an EAGAIN (G_IO_STATUS_AGAIN) and
> we wait SECONDS_TO_SLEEP_ON_EAGAIN before retrying the
> read. This results in a ton of time where we're not
> reading any data at all, killing our throughput.
> 
> 0.75 seems like an eternity to me, but it might be a
> reasonable setting on a slow network (dialup?). 
> 
> --- Tom Dexter <address@hidden> wrote:
> 
> > > 
> > > I have noticed this slowdown also.
> > > 
> > > When getting smallish jpg files the slowdown is
> > almost 50%, When getting
> > > larger rar (5-15MB) files the slowdown is around
> > 10%.
> > > 
> > > When decoding and saving monster 50-100MB files
> > download actually stops
> > > for the duration of the decode and save operation.
> > > 
> > > I suspect this is all because of the new single
> > thread model used by the
> > > program. On a slow network connections this would
> > not be so bad, but
> > > faster networks will fill up TCP windows and block
> > during disk I/O.
> > > 
> > > mk
> > > 
> > 
> > Even if the download does in fact stop during the
> > decode and save, I don't 
> > think that's the cause of what I'm seeing.  When I
> > download large rar 
> > files using one server thread, the 0.14.2 version
> > will generally download 
> > as 800 to 900 KB/Sec, and the CVS version is
> > consistently 1/4 that speed 
> > or slower.
> > 
> > Tom
> > 
> > 
> > 
> > 
> > _______________________________________________
> > Pan-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/pan-devel
> > 
> 
> 
> 
>       
>               
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