SSD Performance problem on 2.6.32

[Robstarusa]

Hello,I recently built a new Proxmox VE server with 3.1/2.6.32 and a seagate S600 SSD.The performance just doesn't seem very good. pveperf gives me 3k fsync/s but only 130M/s reading rate.If I do a "dd if=/dev/sda of=/dev/null bs=1M" my read rate is also 130MB.Changing nothing & booting into an xubuntu live cd and dropping to CLI, the same "dd" test gives me 524M/s.a dmesg | grep -i ata tells me the sata link is up at 6.0Gbit/s.Anything I'm obviously missing or should I be running the 3.x kernel & abandon openvz support?Has anyone else seen/solved this issue?Thanks,Robert

 

[mir]

What filesystem and mount options do you use for the SSD?

 

[Robstarusa]

I'm reading directly from the device with my dd command so bypassing the filesystem.

I just installed the 3.10 proxmox kernel & this improved my read speeds to ~ 450MB/s. Significantly better than 130M/second. My pveperf buffered reads went to 360M/second but my fsyncs went to 45.8/s ...?

 

[mir]

SATA2 and Device Model: OCZ-AGILITY3

dd if=/dev/sda of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 4.97229 s, 216 MB/s

pveperf
CPU BOGOMIPS: 32548.02
REGEX/SECOND: 1290547
HD SIZE: 9.18 GB (/dev/disk/by-uuid/f66cdc9c-9cf8-4c31-802d-21b9ffcf0493)
BUFFERED READS: 200.91 MB/sec
AVERAGE SEEK TIME: 0.24 ms
FSYNCS/SECOND: 1174.81
DNS EXT: 67.07 ms
DNS INT: 0.73 ms (datanom.net)

 

[Robstarusa]

SATA2 and Device Model: OCZ-AGILITY3dd if=/dev/sda of=/dev/null bs=1M count=10241024+0 records in1024+0 records out1073741824 bytes (1.1 GB) copied, 4.97229 s, 216 MB/spveperf CPU BOGOMIPS: 32548.02REGEX/SECOND: 1290547HD SIZE: 9.18 GB (/dev/disk/by-uuid/f66cdc9c-9cf8-4c31-802d-21b9ffcf0493)BUFFERED READS: 200.91 MB/secAVERAGE SEEK TIME: 0.24 msFSYNCS/SECOND: 1174.81DNS EXT: 67.07 msDNS INT: 0.73 ms (datanom.net)

I'm not sure what you are trying to show me. All I know is that keeping all bios settings/hardware the same, my ssd is running at 1/4 sequential speed when not on 3.10. Is that a bug? I'd really like to run on 2.6.32 to have access to openvz

 

[mir]

I'm not sure what you are trying to show me. All I know is that keeping all bios settings/hardware the same, my ssd is running at 1/4 sequential speed when not on 3.10. Is that a bug? I'd really like to run on 2.6.32 to have access to openvz

I was trying to show you that proper SSD speed on 2.6.32 kernel isn't impossible so something must be "wrong" in your setup. My guess would be that the 2.6.32 kernel in someway fails to proper support your motherboards chipset. What motherboard and chipset do you use (manufacturer, brand) ?

 

[Robstarusa]

I was trying to show you that proper SSD speed on 2.6.32 kernel isn't impossible so something must be "wrong" in your setup. My guess would be that the 2.6.32 kernel in someway fails to proper support your motherboards chipset. What motherboard and chipset do you use (manufacturer, brand) ?

It's an Asrock 890FX Deluxe4. dmesg says it negotiated a 6Gbit/s sata link with the 6Gbit port it's on (I"m using the SB sata chipset, not the marvell stuff).Open to any suggestions.

 

[mir]

What speed do you get if you use the Marvell controller?

 

[kataklysm]

Hello,I recently built a new Proxmox VE server with 3.1/2.6.32 and a seagate S600 SSD.The performance just doesn't seem very good. pveperf gives me 3k fsync/s but only 130M/s reading rate.If I do a "dd if=/dev/sda of=/dev/null bs=1M" my read rate is also 130MB.Changing nothing & booting into an xubuntu live cd and dropping to CLI, the same "dd" test gives me 524M/s.a dmesg | grep -i ata tells me the sata link is up at 6.0Gbit/s.Anything I'm obviously missing or should I be running the 3.x kernel & abandon openvz support?Has anyone else seen/solved this issue?Thanks,Robert

Kernel 2.6.32 Patch http://www.theirek.com/blog/2014/02/16/patch-dlia-raboty-s-enierghoniezavisimym-keshiem-ssd-diskov