Re: setfacl curiously slow

["Vladimir V. Saveliev" <vs@namesys.com>]

Hello

On Tuesday 12 September 2006 23:23, Dragan Krnic wrote:
> Hi, everyone,
>
> I've migrated important user data from an older PC to some fairly
> contemporary hardware.
>
> The old hardware was Intel Pentium 4 3 GHz, single CPU, 2 GB RAM,
> 6 x 250 GB S-ATA connected via 2 Promise Tx2 cards and the on-board
> 2-port controller, managed as a software raid5 with 5 disks and 1 spare,
> with 83% used up, which is about 790 gigibytes net.
>
> The new hardware is a Tyan S2895, 2 dual-core Opteron280, 8 GB RAM,
> 8 x 500 GB S-ATA connected via Areca ARC-1120 133 MHz/64-bit PCI-X
> 8-port, managed as a hardware raid5 with 8 disks no spares.
>
> The tar backup of the old machine to a second similarly new PC ran at
> about 30 MB/s. The tar restore onto the new hardware was about twice as
> fast, as was expected.
>
> But! The restoration of ACLs took an enormous amount of time.
>
> The ACLs backup was created on the old machine in about 28 minutes,
> but it took 74 minutes to restore the ACLs on the new hardware. During
> that time the disk activity looked like what you can see in the enclosed
> PDF file. Short intervals of intense writing with much longer intervals of
> inactivity. In top the process "setfacl --restore=acls.local" and "pdflush"
> were in state "D" all the time. From time to time a process "reiserfsd"
> joined them in the same state.
>
> A login to the computer during that time was considerably slowed down.
> Otherwise the computer was still free from any load.
>
> I'm not sure if that's a problem or just normal but you will know better.
>

I believe Jeff as reiserfs acl author will be interested by this question.
But may I ask you to try your test on ext2 to check whether ACL restoring is 
much faster there?

> There were 796,115 files to apply ACLs to.
>
> Best regards,
> Dragan
>
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