[CentOS] nfs slow?

Craig White craigwhite at azapple.com
Wed Dec 17 04:37:52 UTC 2008


On Tue, 2008-12-16 at 16:15 -0800, Russell Miller wrote:
> On Tue, Dec 16, 2008 at 4:10 PM, nate <centos at linuxpowered.net> wrote:
> > Russell Miller wrote:
> >
> >> I have some pretty graphs, but the long and short of it is, while the
> >> read times are comparable, the write times for the stock kernel.org
> >> kernel are over twice as fast.  I mean it's pretty much blowing the
> >> RHEL/CentOS kernel out of the water.
> >
> > What sort of I/O controller?
> >
> 00:06.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8111 PCI (rev 07)
> 00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-8111 LPC (rev 05)
> 00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-8111 IDE (rev 03)
> 00:07.2 SMBus: Advanced Micro Devices [AMD] AMD-8111 SMBus 2.0 (rev 02)
> 00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-8111 ACPI (rev 05)
> 00:0a.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12)
> 00:0a.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01)
> 00:0b.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12)
> 00:0b.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01)
> 00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] HyperTransport Technology Configuration
> 00:18.1 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Address Map
> 00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] DRAM Controller
> 00:18.3 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Miscellaneous Control
> 00:19.0 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] HyperTransport Technology Configuration
> 00:19.1 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Address Map
> 00:19.2 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] DRAM Controller
> 00:19.3 Host bridge: Advanced Micro Devices [AMD] K8
> [Athlon64/Opteron] Miscellaneous Control
> 01:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b)
> 01:00.1 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b)
> 01:06.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
> 02:03.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704
> Gigabit Ethernet (rev 10)
> 02:03.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704
> Gigabit Ethernet (rev 10)
> 03:01.0 RAID bus controller: 3ware Inc 9xxx-series SATA-RAID
----
we're getting pretty far afield of the OP's original issue but ISTR that
the 3ware 9xxx-series SATA RAID is especially slow in RAID-5 so if
that's what you're doing, it would make sense that newer kernels than
the ones RHEL/CentOS would ship out would get better performance as they
probably have significantly upgraded the driver code for that
controller.

But none of this relates to CentOS performance as NFS client to Solaris
NFS server.

Craig



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