I actually consider this very customer-unfriendly behavior. It will
sometimes read the entire file into memory, say the transfer is
complete (more or less, visually) and then take a very long time
without progress indicator to write out the file.
Quoting Narcis Garcia <[email protected]>:
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!
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