Although dilesystem/device write cache is a kernel level feature, userspace tools can ask kernel for syncing.
I suppose in UG 32-bit UG variant it's kernel responibility to not apply write cache for USB block devices, but in UG 64-bit write cache is working for those cases. When write cache is working, Nautilus calls some sync at end of copying files. You can reproduce it with UG 14.04 (64-bits): 1. Plug an USB pendrive (4GiB or more) 2. Copy there files bigger than 1GiB, from a faster volume (hard disk p.e.) You will see a reasonable speed from 1% to 99%, but at the end you will see Nautilus talking about 0 seconds remaining during large time. When Progress dialog closes, pendrive activity finishes inmediately. That "large time" lapse only can be the sync task. El 15/07/15 a les 10:57, Tim ha escrit: > > > On 15/07/15 18:51, Narcis Garcia wrote: >> Hello, >> >> I've seen that in Ubuntu-Gnome 14.04 (32-bits), when copying files from >> internal device to USB store (such as pendrive), disk write cache is not >> working. >> >> In Ubuntu-Gnome 14.04 (64-bits) disk write cache works (it's better), >> but at the end of copy progress bar cache is synced, and I feel is >> convenient to wait before doing more write operations. >> >> My question: >> Is there any way to configure Nautilus to not sync write cache at any >> time (only when umount, of course)? > filesystem write cache is a kernel level feature, I seriously doubt nautilus > has any knowledge of that! >> >> > > -- Ubuntu-GNOME mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-gnome
