Messages in this thread |  | | Subject | Re: Dumping /dev/zero to the console | Date | Mon, 22 Jul 1996 12:17:10 -0400 (EDT) | From | "Andrew E. Mileski" <> |
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>>> On linux console, even as a non-priv user, do a: >>> % dd if=/dev/zero bs=1024k >> >> For what it's worth, this has absolutely no effect on my machine when >> using a block size of 1024 (not 1024k). I let it run for quite a while >> (forgot it was running), and stopped it after about 90Gb. > > Of course. That is why I said 1024k and not 1024. There is a big > difference. Or do you consider a factor of approx 1000 insignificant?
I tried it with bs=1024k on the slowest machine I have access to (a P5-100 with 256k PB cache and 8Mb FPM RAM) running kernel v1.2.1.
The results were worse, but not a lock-up. The system CPU time went to nearly 100%, but switching VCs was not affected. Response was slower than normal, but the system was still usable. Memory consumption did not increase (no swapping).
I see your point - any user can eat all the CPU time with this. This is "Not a good thing". I don't know if the driver needs to be adjusted, or perhaps we have to wait for CPU quotas.
- -- Andrew E. Mileski mailto:aem@ott.hookup.net http://www.redhat.com/~aem/ Linux Plug-and-Play Project Leader http://www.redhat.com/linux-info/pnp/ PGP Public Keys: mail with 'Subject: help' to pgp-public-keys@keys.pgp.net
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