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...files and creating a snapshot creates a new set of files that contain modifications from the originals. The problem is that during the rsync process the user's machine is barely usable. The reason is because rsync reads these 2GB files... many GBs of them. This causes the user's machine to repeatidly trash the page cache. This really is Linux's fault. It should realize the relative priority of the two apps and prevent rsync from trashing the cache. But it doesn't. Allowing rsync to specific O_DIRECT would circumvent the page cache completely. Preventing the cache from being trashed....

Hi. I'm having trouble with nut-2.0.3 on a linux kernel 2.4.32 machine and a MGE Evolution 3000. The problem is that I'm getting the following message, repeatidly, on dmesg: usbdevfs: usb_submit_urb returned -22 (-22 means -EINVAL) I traced the problem with newhidups -DDDDDD auto and found out that the -22 error appears in a line "none (-22)" of the output as: ---------- upsdrv_updateinfo... Waiting for notifications... none (-22) entering...