From mboxrd@z Thu Jan 1 00:00:00 1970 From: andrey mirtchovski To: 9fans@cse.psu.edu Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Subject: [9fans] drawterm strangeness Date: Thu, 5 Jun 2003 18:48:11 -0600 Topicbox-Message-UUID: c5c0c9e0-eacb-11e9-9e20-41e7f4b1d025 I'm observing some strangeness in drawterm on Linux. I know it's not supported at all, but I'd like to take this out in the open, just in case somebody can think of an off-hand solution. It has to do with updating the image, but I'm not sure whether it's not related to Russ Cox' latency observation from few weeks ago: When displaying graphics-heavy programs under drawterm-linux I observe that the screen updates in bursts occuring exactly one second one after another. For example, dragging a new window (especially enlarging it rapidly) would result in the screen updating only a single, or at most two times per second. When running the same few draw()-intensive programs I measured the connection utilization to peak at 20mbit/s (100mbit link). Starting new programs to separate the load between them did not result in any increase in throughput to the linux box. The load on the server was not max-ed out, but the ethernet counters in 'stats' were. On the other hand an scp of a very large file resulted in transfer speeds of 97mbit/s (as measured on the Linux side). No writing or reading from disk was involved (writing same file to kfs instead of /dev/null or ramfs caused the transfer speed to drop down to 10-20mbit/s, but that's not an issue). I did the same test with Plan 9 running under vmware of the exact same hardware and observed the same behaviour. I do not observe this behaviour when connecting from a plan9 terminal or from the same vmware session. The reason I'm having trouble with this is that the brand spanking new cpu server is hardly usable with drawterm -- especially when heavy editing is involved.. thanx for any help with this: andrey ps: one suggestion I heard was to blame nagel's algorithm for this, but the 9fans archives suggest that plan9 doesn't do nagel at all...