Messages in this thread | | | Subject | Re: System unresponsitive when copying HD/HD | Date | Sun, 4 Feb 2001 11:01:27 +0000 (GMT) | From | Alan Cox <> |
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> 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?
No
> b) should I expect other disk operations to be denied service as long as > the write is 'flushing'?
No
But try 2.4.1 before worrying too much. That fixed a lot of the block performance problems I was seeing (2.4.1 ruins the VM performance under paging loads but the I/O speed is fixed ;))
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