On Wed, 11 Mar 2009 15:35:29 +0100 Adam Tkac <at...@redhat.com> wrote:
> > If non-SIMD JPEG is not so slower than raw encoding we can prefer > Tight JPEG encoding all the time. Otherwise we can use JPEG on low and > medium bandwidth nets and raw on high bandwidth nets. I think that > current algorithm which is currently in CConn.cxx will be reused. > > We should always send "second preferred" encoding to server in case > that server doesn't support JPEG. So, in theory, existing code will be > improved this way: > > for speeds >= 16Mbps client sends "Raw, JPEG, hextile, zrle" > for speeds < 16Mbps client sends "JPEG, zrle, hextile" > > (Note: with JPEG I mean Tight encoding, of course) > I'm not convinced we should ever put Raw at the top. The bandwidth detection is flaky and often over-estimates the bandwidth. And raw isn't even used today, so we wouldn't be worse off by not adding it. A more fair comparison would be between Hextile (the current high bandwidth option), and JPEG. JPEG and Hextile have about the same CPU usage at a "perceptually lossless" JPEG setting, but JPEG consumes a tenth of the bandwidth. And the bandwidth can be an issue, even on a LAN. Playing some video easily saturates a 100 Mbps link with raw, whilst with JPEG I get a very pleasurable experience at around 10 Mbps (and this is without SIMD!). Hextile is better than raw, but still easily fills 100 Mbps. IMO, raw and hextile are not acceptable choices until you have at least a gigabit network. Rgds -- Pierre Ossman OpenSource-based Thin Client Technology System Developer Telephone: +46-13-21 46 00 Cendio AB Web: http://www.cendio.com
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