-------- Mensagem original --------
Assunto: Re: Filesystem for Maildir
De: Christopher Chan <christopher@xxxxxxxxxx>
Para: CentOS mailing list <centos@xxxxxxxxxx>
Data: terça-feira, 04 de dezembro de 2007 12:06:43
Heitor A.M. Cardozo wrote:
Christopher Chan wrote:
ext3 again takes the slowest performing title overall as
expected...in fact it appears not much as changed fs vs fs wise
since Bruce Guenter's tests.
I agree but the values are more "acceptable" in comparision with
others filesystems. On Bruce tests it shows a very bad performance
for reading.
Yes, reads are vastly improved at the cost of write performance.
Weird. XFS has like the best read response times too. XFS is looking
very good at the moment with just about the fastest performance in
everything. What io-scheduler is default on Centos 5? I assume you
prefer read performance to write performance. After all, it is for
maildir use. Have you tuned the box for read performance?
Initially this box is not tuned for read because I would to compare the
results of tests on default configuration with other configurations.
The default io-scheduler on CentOS 5 is CFQ.
But I am surprised at the overall performance regressions in
comparison to 2.6.5/6 kernels with regards to deliveries vs amount
of writers.Heitor, you are using a 3ware 95xx or 96xx with BBU write
cache and write caching on right? How much RAM do you have for your
cache? How is your raid10 configured? I cannot believe a four disk
raid0 array can beat a software raid mirror of scsi disks as used by
Bruce Guenter.
3ware 9650SE with BBU and write cache on.
Available memory: 224 MB
Bus Type/Speed: PCIe/2.5 Gbps
RAID10: 4 RAID1 subunits with MAXTOR STM3500630AS 500GB SATA2
Yup, that is four disks versus a single linux mirrored scsi array.
Write performance cannot be that horrible now can it?
Sorry, i forgot to say that the stripe size is set at 64Kb, not that
this explain the bad write performance. I will configure and initilize
array again and repeat one test to check.
Thanks Heitor. Is the site down or something? I cannot access the
page....it is timing out.
The site is online now.
thanks.
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