[Lustre-discuss] performance issues in simple lustre setup

[murray]

OK, I have a work around.  I removed the tcp option from the lnet
configuration so that it now
reads:

options lnet networks="o2ib"

options mlx4_core       msi_x=1
alias ib0 ib_ipoib
alias ib1 ib_ipoib

Now I am seeing write bw > 70 MB/sec.
Thanks,
murray

Murray Smigel wrote:
> Hi,
> I have built a simple lustre setup. MDS and OSS are both on a Centos5
> machine using the red hat lustre modified kernel
> 2.6.18-8.1.14.el5_lustre.1.6.4.1 running OFED-1.3.  Lustre is 1.6.4.3.
>
> The client machine is Debian running the same kernel and OFED-1.3 and
> lustre 1.6.4.3.
>
> The MDT and OST are both single partitions on the the same disk (yes,
> I know this is not optimal...)
> The network uses Mellanox ConnectX HCAs running through a Voltaire
> ISR2004 switch.
>
> The basic RDMA setup seems to work in either direction:
> murray at nasnu3:/slut$ ib_rdma_bw 192.168.3.50 (Lustre server)
> 5605: | port=18515 | ib_port=1 | size=65536 | tx_depth=100 |
> iters=1000 | duplex=0 | cma=0 |
> 5605: Local address:  LID 0x07, QPN 0x22004e, PSN 0x323aa6 RKey
> 0x1a002800 VAddr 0x002aaaaaad6000
> 5605: Remote address: LID 0x05, QPN 0x8004f, PSN 0x67c28c, RKey
> 0x8002800 VAddr 0x002aaaab705000
>
>
> 5605: Bandwidth peak (#0 to #985): 1332.53 MB/sec
> 5605: Bandwidth average: 1332.47 MB/sec
> 5605: Service Demand peak (#0 to #985): 1462 cycles/KB
> 5605: Service Demand Avg  : 1462 cycles/KB
>
> [murray at lusty bin]$ ib_rdma_bw 192.168.3.30 (Lustre client)
> 3845: | port=18515 | ib_port=1 | size=65536 | tx_depth=100 |
> iters=1000 | duplex=0 | cma=0 |
> 3845: Local address:  LID 0x05, QPN 0xa004f, PSN 0x4f4712 RKey
> 0xa002800 VAddr 0x002aaaab705000
> 3845: Remote address: LID 0x07, QPN 0x24004e, PSN 0xa740c1, RKey
> 0x1c002800 VAddr 0x002aaaaaad6000
>
>
> 3845: Bandwidth peak (#0 to #956): 1533.5 MB/sec
> 3845: Bandwidth average: 1533.43 MB/sec
> 3845: Service Demand peak (#0 to #956): 1146 cycles/KB
> 3845: Service Demand Avg  : 1146 cycles/KB
>
> Local disk speed on the Lustre server seems fine, as does speed when
> the Lustre machine writes
> to the Lustre mounted drive (50-80 MB/s).
> [murray at lusty slut]$ dd if=/dev/zero of=foo bs=1048576 count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB) copied, 13.5875 seconds, 79.0 MB/s
>
> Performance of the client machine writing to the Lustre drive is poor
> (12 MB/s)
> murray at nasnu3:/slut$ mount -t lustre -l
> 192.168.3.50 at o2ib:/lusty on /slut type lustre (rw)
>
> murray at nasnu3:/slut$ dd if=/dev/zero of=foo bs=1048576 count=1024
> 1024+0 records in
> 1024+0 records out
> 1073741824 bytes (1.1 GB) copied, 88.9857 seconds, 12.1 MB/s
>
> Similar results from using Bonnie++ for the testing.
>
> Any ideas as to what might be going on?
> Thanks,
> murray
>
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