Slow write speeds after upgrade

[outsider]

I just upgraded to 5.0 rc1 today (from 4.5), and have noticed a substantial speed decrease while writing to the user share over the network.

Last night I did some quick tests (to benchmark version 4.5 which is what I upgraded from) and I was able to write to the user shares at around 10-12MB/s over the network (in samba from a win7 machine).

Now after the parity check has finally finished (after upgrading to 5.0rc1), I am only able to write at just under 1MB/s (which is ridiculously slow).

 

I must have a setting wrong somewhere, but have no idea where to even look.

Any direction/advice would be greatly appreciated.

 

P.S. I did follow the guide in the wiki when upgrading from 4.5.

 

adrian

[dgaschk]

Post a syslog.

[outsider]

I've attached my syslog.

syslog-2012-04-28.txt

[BRiT]

What do you see after executing the following at a root command prompt: ethtool eth0

[outsider]

Here you go BRiT

 

root@Tower:/# ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Half 1000baseT/Full 
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Half 1000baseT/Full 
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                             100baseT/Half 100baseT/Full 
                                             1000baseT/Full 
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
        Link detected: yes

[Johnm]

5rc1 has SMB2 turned on now. maybe try it with SMB(1)?

otherwise I might suspect a changed driver? NIC or HBA.

 

[GFOviedo]

5rc1 has SMB2 turned on now. maybe try it with SMB(1)?

otherwise I might suspect a changed driver? NIC or HBA.

 

How do you turn on / off SMB1 and SMB2?

[outsider]

Talking about Samba, I just realized that I did some NFS file transfers too (using rsync) and the file copy speed was similar, so I don't think it's a Samba thing.

 

Is it worth blowing away all the config files (after making a backup of course) off the USB stick and putting on a clean install and see if the problem persists?

[Johnm]

A lot of people mentioning slower speeds on 5rc1.

[outsider]

It's not a network problem.

I just verified that running rsync -v --progress /mnt/disk1/fileA /mnt/disk2/ also yields very poor speeds in my system. I'm getting around 1MB/s transfer rate, which means disk access is hindered somehow.

 

Any help would be appreciated.

[outsider]

Another test to verify that the problem is disk related and not network related:

Running the command  (to create a file filled with zeros)

dd if=/dev/zero of=output.dat  bs=1024  count=10240

 

On a desktop I get 104MB/s (I realize this is a burst speed as the file created is not very large; this number drops to 45MB/s when the file created is 1GB)

On the UnRaid server (running on dedicated hardware) I get 938kB/s (I did not dare do a 1GB file at these speeds)

 

Read speeds are normal (by running hdparm -tT /dev/md1 ) I get 82MB/s on the same disk in the UnRaid machine.

 

All disks show similar performance numbers.

 

I also just checked, and the "Force NCQ Disable" is set to YES (to disable NCQ)

 

[outsider]

I blew away my current settings and put on a fresh copy of 5.0 rc1 and started from scratch. Assigned the drives and waited for the initial parity check to finish.

Speed results were identical as in last post.

 

I then successfully downgraded to 5.0-beta 14a.

(Again, I blew away all the setting and started from scratch to eliminate any bad settings I may have had)

 

Now when I run  dd if=/dev/zero of=output.dat  bs=1024  count=102400

I get around 30-40MB/s on a disk, and I get 8-12MB/s when doing it in a user share.

 

I'm happy.