Felix Marti <[EMAIL PROTECTED]> wrote: > > [Felix Marti] Aren't you confusing memory and bus BW here? - RDMA > enables DMA from/to application buffers removing the user-to-kernel/ > kernel-to-user memory copy with is a significant overhead at the > rates we're talking about: memory copy at 20Gbps (10Gbps in and 10Gbps > out) requires 60Gbps of BW on most common platforms. So, receiving and > transmitting at 10Gbps with LRO and TSO requires 80Gbps of system > memory BW (which is beyond what most systems can do) whereas RDMA can > do with 20Gbps!
Actually this is false. TSO only requires a copy if the user chooses to use the sendmsg interface instead of sendpage. The same is true for RDMA really. Except that instead of having to switch your application to sendfile/splice, you're switching it to RDMA. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
