 | | | Poor IO with 2.4.21-4.EL vs 2.4.22-ac4 | Poor IO with 2.4.21-4.EL vs 2.4.22-ac4 2003-11-18 - By Steve Mickeler
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I 'm really hoping for an decent answer to this one because I 'm extremely
dissapointed by 2.4.21-4.EL 's IO
Server = Dell 6650
Disks = 5 x 73GB Maxtor 10K RPM disks in a Raid 5 setup with Dell 's PCI
PERC 3/DC card using the megaraid driver.
CPU = 2 x 2.8Ghz XEON
Memory = 4GB
I create a 2GB file via:
dd if=/dev/zero of=testfile bs=2048 count=1000000
With AS 3 on the box running the 2.4.21-4.EL kernel I run :
"tar cpvf testfile.tar testfile " will take anywhere from 3m10s to 4m7s
Same box, but compiled 2.4.22 + -ac4 patch, both retrieved from
kernel.org, the same "tar cpvf testfile.tar testfile " takes no more than
1m10s
I continue to delete testfile.tar and tar again with testfile1.tar and so
on, doing 10 or so per kernel and the AS 3 supplied kernel is extremely
slow.
Can someone please shed some light on this ? The company I work for just
purchased 6 RH AS licenses but if this is the kind of performance we 're
getting from an "Enterprise " grade kernel, then we will have no choice but
to return the AS product.
Thanks.
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