NFS slow write speed with sync option

[Xandão]

Hi All

I have a NFS server that exports its /home partition.
When I mount this partition using sync option in client I have a normal read speed but a VERY SLOW write speed like I show below:

[desultory]

Though perhaps not quite to the extent described, I would expect such behavior.

Setting the sync option on a filesystem is supposed to keep the data present in the filesystem synchronized with the data cached by the kernel regarding that filesystem. Considering that NFS is, obviously, using a network connection (even if it is accessed over a loopback device) using the sync option when mounting an NFS share would be expected to introduce significant latency in all write operations as buffering is largely (at the filesystem level) removed from the filesystem.

Note that mounting local storage with the sync option active also causes increased write latency though it is typically less obvious.

[Xandão]

Thanks desultory

I´d expect an increase of latency with sync option, but not with that magnitude (6 seconds to 6 minutes to write the same amount of data). This could be considered "normal"??? If yes, the use of sync option makes impracticable its use in most of current network applications, in my opinion.
If I use async option, I can consider my system unsafe or, like I said initially, am I being paranoic?
Thanks!
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Xandão

[mounty1]

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