Messages in this thread |  | | Date | Sat, 03 Feb 2001 12:07:21 -0800 | From | LA Walsh <> | Subject | Re: System unresponsitive when copying HD/HD |
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I've noticed less responsive disk response on 2.4.0 vs. 2.2.17. For example -- I run vmware and suspend it frequently when I'm not using it. One of them requires a 158Mb save file. Before, I could suspend that one, then start another which reads in a smaller 50M save file. The smaller one would come up while the other was still saving. As of 2.4, the smaller one doesn't come up -- I can't even do an 'ls' until the big save finishes.
Now big image program has actually exited and I can close the window -- the disk writes are going on from the disk cache with 'kupdate' taking some minor fraction (<1%) of the CPU and the rest of the system being mostly idle.
If I have vmstat running, I notice blocks trickling out to the disk, 5sec averages 495,142,151,155,136,257,15,0. Note that the maximum read rate (hdparm -t) of this disk is in the 12-14M/s range. I'm getting about 1-5% of that on output with the system's disk subsystem being apparently unable to do anything else.
This is with IDE hard disk with DMA enabled.
a) is this expected performance on a large linear write? b) should I expect other disk operations to be denied service as long as the write is 'flushing'?
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