Messages in this thread | | | Date | Tue, 12 Sep 2006 20:18:34 -0500 | From | Rudy Klinksiek <> | Subject | ext2/ext3 balancing streaming io - help |
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Hi:
Don't know if this is the right list, if not I apologize and ask someone to point me to right mailing list.
For 2.4.27 with low-latency patches, is there a way to balance data streaming in ( around 4-8Mb/sec )with writing it to disk, using an ext2 or ext3 filesystem. The system has a single disk, and can sustain 10-20MB/sec for 2-4 secs. And yes I'm stuck with this particular system.
Twiddling with bdflush parameters, I had a setup that was doing this ( monitoring with "vmstat 1" ) but it is not really reproducible. Mostly, data is flushed out in chunks, often 1/2/3 secs with nothing written in between flushes. Eventually freemem is depleted, with cache increasing, but the rate going out to disk is still generally less than the ncoming rate.
After shutting down the input side, it takes many 10's of secs for vmstat to show nothing going to disk.
"bdflush" doesn't seem to have enough/correct knobs to effect a "streaming" mode.
Or am I missing something here? Any other tunable parameters?
Any help appreciated klink
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