From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0rc1) Gecko/20020417 Description of problem: I use avifile to divx capture tv to disk at 320x240. Under 2.4.9-31 & 2.4.3 I can capture/compress without frame drops, but under kernel-2.4.18-22 & 26 I get 2-3% frame drops which seem to be tied to disk flushing activity. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1.grab athlon with scsi disk subsystem (u2w striped) 2.install avifile0.7-20020426 3.capture 5minutes at 320x240 fps divx4 (low-motion) 4.review frame drops Actual Results: Under 2.4.9 I get less that 1% (13 out of 4200 frames captured) dropped Under 2.4.18 I get about 2-3% drops in bursts clustered arround scsi-disk io. By contrast my 2.4.3 kernel system (K7-800 ide disk) drops 4 frames in a hour. Additional info: As near as I can tell, this tied to the new VM subsystem, based on the frame drops not occuring under prior kernel releases (I used 2.2.19 & 2.4.3 also with no frame drops). So despite Morton's low-latency patch in 2.4.18-22/26, there appears to be issues still with the VM subsystem flushing buffers to disk. I can aggravate the issue by adjusting the bdflush parameters, but can't prevent it.