On 07/29/03 18:31, Ravi Wijayaratne wrote:
Hi,
We are seeing a %15 performance drop when we move from XFS 1.1 to 1.2.
Here are some of our particulars:
We have been testing the performance of Linux-2.4.19 and XFS 1.2 with NetBench.
We compared the performance with that of Linux-2.4.18 and XFS 1.1.
We have been running Samba 3.0.
The following are the configuration settings:
RAID config 0 or 5: 4 drives with chunk size of 64
xfs_info.sh /hd/vol_mnt0/
meta-data=/hd/vol_mnt0 isize=2048 agcount=74, agsize=1048560 blks
data = bsize=4096 blocks=76644352, imaxpct=25
= sunit=16 swidth=16 blks, unwritten=0
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=9360 version=2
= sunit=16 blks
realtime =none extsz=65536 blocks=0, rtextents=0
We are running software RAID 0 and 5 (md). The performance numbers were
obtained after the
RAID sync was completed.
For Linux 2.4.18-XFS-1.1 case we used log version 1.
For Linux 2.4.19-XFS-1.2 case we used log version 2.
At mount time we changed the internal log size from 64k-256k, but that change
did
not show any difference.
We see about a 15-20% drop in performance. To rule out the file system we
created
an ext2 file system on the same volume and compared the perofrmance. We see that
ext2 with Linux 2.4.19 performs much better that Linux 2.4.18.
Has the throughput of XFS 1.2 been shown to be less than that of XFS 1.1 with
generic benchmarks?
Are there any patches since the final release of xfs 1.2 that will improve XFS performance?
Are there any XFS 1.2 specific tuning we can do to ramp up the performance?
Some insight is much appreciated
My understanding is that the XFS code that matters is in the kernel. Thus,
moving to a latter kernel version might improve things.
--
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L. Friedman netllama@xxxxxxxxxxxxx
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