John, Did you get my email about the person's name in Intel? I think finding his name is not that important. Finding the problem and solution is more important.
RD -----Original Message----- From: Ronciak, John [mailto:[email protected]] Sent: Friday, March 27, 2009 8:42 AM To: [email protected]; 'Jay Vosburgh' Cc: [email protected] Subject: [work] RE: [E1000-devel] Bug report E1000 driver bonding in 802.3ad mode can not go beyond 1GB/s throughput >Intel engineers told us that if not in 802.3ad mode, the >throughput will be >limited to 1GB/s. >But we are setting up the 802.3ad mode on these 82546 chips. Who at Intel are you talking to? Cheers, John ----------------------------------------------------------- "...that your people will judge you on what you can build, not what you destroy.", B. Obama, 2009 >-----Original Message----- >From: Support Team [mailto:[email protected]] >Sent: Friday, March 27, 2009 8:32 AM >To: 'Jay Vosburgh'; [email protected] >Cc: [email protected] >Subject: Re: [E1000-devel] Bug report E1000 driver bonding in >802.3ad mode can not go beyond 1GB/s throughput > >Hi Jay, > >Our date stream to the bond interfaces are sending requests >and data replyes >at 4GB/s. >The xmit_hash_policy is L3+4. > >However, we noticed that if we just apply 1GB/s load, the CPU >usage is about >25%. Adding >more load will increase the CPU usage all the way to 100%, but the >throughput would not >go up at all. > >Intel engineers told us that if not in 802.3ad mode, the >throughput will be >limited to 1GB/s. >But we are setting up the 802.3ad mode on these 82546 chips. > >What else do you think can cause this limit? Just for make >this clear, we >use the >E1000E driver with 8257x chip can get throughput scale well, with same >kernel configuration >and testing environment. > >Thanks! >Wayne > >-----Original Message----- >From: Jay Vosburgh [mailto:[email protected]] >Sent: Friday, March 27, 2009 7:02 AM >To: [email protected] >Cc: [email protected] >Subject: [work] Re: [E1000-devel] Bug report E1000 driver >bonding in 802.3ad >mode can not go beyond 1GB/s throughput > >Support Team <[email protected]> wrote: > >>Hello, >> >>Intel [email protected] recommended us to >open a ticket >>with you that >>your e1000 driver for 82546 chips has throughput limit. With 802.3ad >>bonding, the total >>throughput of 8 NIC is still 1GB/s, same as single NIC. > > How are you testing throughput? If you're only running a single >stream test, you'll only see the throughput of one adapter. This is by >design, the 802.3ad standard requires that a given "conversation" (TCP >connection, stream of UDP packets to/from the same ports, etc) be sent >across the same slave adapter. This is done to prevent reordering of >packets within the conversation. > > If you're running multiple streams, then you may want to set the >xmit_hash_policy option to layer3+4 or layer2+3. The layer3+4 >hash will >place multiple streams between the same two peer systems on multiple >slaves (with a small risk of packet reordering if IP fragments are >generated); the layer2+3 won't, but will place all traffic for a given >peer on the same slave (but balances better than the default layer2 >hash). > > The hashes are described in detail in the bonding.txt >documentation supplied with the kernel source. > > -J > >--- > -Jay Vosburgh, IBM Linux Technology Center, [email protected] > > > >--------------------------------------------------------------- >--------------- >_______________________________________________ >E1000-devel mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/e1000-devel > ------------------------------------------------------------------------------ _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel
