Hello,
Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x?
Thanks,
On Thu, Aug 12, 2010 at 3:01 PM, Jerry Franz jfranz@freerun.com wrote:
On 08/12/2010 05:56 AM, Daniel Bruno wrote:
Hello,
Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x?
I don't know about 10/100. For 10/100/1000 I use Intel quad port boards. They work fine.
-- Benjamin Franz _______________________________________________
Sorry to hijack this thread, but it could be relevant. As matter of interest, do these cards offer lower throughput than 4x single 1GB cards?
On 08/12/2010 06:06 AM, Rudi Ahlers wrote:
On Thu, Aug 12, 2010 at 3:01 PM, Jerry Franzjfranz@freerun.com wrote:
On 08/12/2010 05:56 AM, Daniel Bruno wrote:
Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x
I don't know about 10/100. For 10/100/1000 I use Intel quad port boards. They work fine.
Sorry to hijack this thread, but it could be relevant. As matter of interest, do these cards offer lower throughput than 4x single 1GB cards?
Depends mostly on if you are using PCI/PCI-X vs PCI-express. At high bit rates you can saturate the old PCI bus. A single gigabit port can pretty much saturate a 32-bit PCI bus at 33MHz.
PCI-express can go a lot faster.
On 08/12/2010 06:06 AM, Rudi Ahlers wrote:
On Thu, Aug 12, 2010 at 3:01 PM, Jerry Franzjfranz@freerun.com wrote:
On 08/12/2010 05:56 AM, Daniel Bruno wrote:
Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x
I don't know about 10/100. For 10/100/1000 I use Intel quad port boards. They work fine.
Sorry to hijack this thread, but it could be relevant. As matter of interest, do these cards offer lower throughput than 4x single 1GB cards?
If you should use them in a PCI slot yes, not if you use them in a PCI-X or PCI-e slot (although you could saturate a PCI-e x1 with 4 gbit ports I think).
Depends mostly on if you are using PCI/PCI-X vs PCI-express. At high bit rates you can saturate the old PCI bus. A single gigabit port can pretty much saturate a 32-bit PCI bus at 33MHz.
PCI-express can go a lot faster.
The Intel Quad cards don't fit (and don't then) in a single PCI slot. The Intel Dual Gbit cards do and you can saturate a PCI slot with it quite easy :)
Regards,
Michel
Sorry to hijack this thread, but it could be relevant. As matter of interest, do these cards offer lower throughput than 4x single 1GB cards?
If you should use them in a PCI slot yes, not if you use them in a PCI-X or PCI-e slot (although you could saturate a PCI-e x1 with 4 gbit ports I think).
Not with the Intel Pro 1000's. The PCIe versions require a x4 slot in the dual or quad configuration. Can't speak to the PCI-X version as I don't have any in my inventory.
On 08/12/10 10:35 AM, Drew wrote:
Not with the Intel Pro 1000's. The PCIe versions require a x4 slot in the dual or quad configuration. Can't speak to the PCI-X version as I don't have any in my inventory.
yeah, a single PCI-E 'lane' (eg, x1) is only about twice as fast as a PCI 32 bit 33Mhz desktop slot. (250MB/sec vs 133MB/sec burst). As soon as you get into multiple devices contending for a channel, actual performance goes down considerably due to the overhead of contention negotiation.
PCI-E x4 has 4 of these lanes, so each of the 4 NICs can effectively have a lane to itself. Full duplex gigE is, in theory, capable of 120MB/sec read *and* 120MB/sec write at the same time, so this exceeds that single 32bit/33Mhz PCI slot by quite a lot..
PCI-E x4 is roughly equivalent to PCI-X (100-133Mhz, 64bit, about 1Gbyte/sec), and any high performance IO device in a server should be in a x4 slot.
As matter of interest, do these cards offer lower throughput than 4x single 1GB cards?
Depends mostly on if you are using PCI/PCI-X vs PCI-express. At high bit rates you can saturate the old PCI bus. A single gigabit port can pretty much saturate a 32-bit PCI bus at 33MHz.
PCI-express can go a lot faster.
Benjamin Franz
And on current multi CPU / multi core plattforms care to have support for MSI-X on the motherboard and by the Ethernet controller (for 10Gbe and virtualization this is even a must to gain maximum performance).
Alexander
On 8/12/2010 7:56 AM, Daniel Bruno wrote:
Hello,
Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x?
Thanks,
I use an Intel Pro 10/100 board on a CentOS 5.5 based router works quite well. I've been using it since RH 7.2 so its well supported under CentOS I bought mine as a dual and then upgraded it to a quad (was way cheaper at the time). Intel made them for Compaq also. Dan
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Rudi Ahlers