[dpdk-dev] [PATCH RFC 05/11] mbuf: merge physaddr and buf_len in a bitfield

[Richardson, Bruce]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Olivier MATZ
> Sent: Monday, May 19, 2014 8:27 AM
> To: Shaw, Jeffrey B; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH RFC 05/11] mbuf: merge physaddr and buf_len in
> a bitfield
> 
> Hi Jeff,
> 
> On 05/09/2014 06:11 PM, Shaw, Jeffrey B wrote:
> > I agree, we should wait for comments then test the performance when the
> patches have settled.
> 
> Here are some performance numbers I've measured with the TSO
> patches. The test platform is:
> 
> +-----------+           +-----------+
> |           |           |           |
> | traffic   |-----------| dpdk      |
> | generator |-----------| testpmd   |
> |           |-----------|           |
> |           |-----------|           |
> |           |           |           |
> +-----------+           +-----------+
> 
> - 4 ixgbe ports
> - sandy bridge at 2.7 Ghz
> 
> I've only included numbers for pkt_size=64. Other packet sizes
> do not bring more information in this case.
> 
> I have 4 test cases:
> 
> - testpmd in iofwd mode with normal tx/rx function
> - testpmd in iofwd mode with simple tx/rx function (txqflags=0xf01)
> - testpmd in macfwd mode with normal tx/rx function
> - testpmd in macfwd mode with simple tx/rx function (txqflags=0xf01)
> 
> I tested this for 1c1t, 1c2t, 2c2t, 2c4t, 4c8t on the following version:
> 
> - dpdk.org head
> - dpdk.org + tso patchs until 6/11 (included): it includes all mbuf
>    reworks (data_offset instead of data, remove ctrl mbuf, use 48 bits
>    physical address)
> - dpdk.org + all tso series

Hi Olivier,
Can you perhaps also include the specific testpmd parameter you used in your tests, as they can have a large effect on performance. On my Sandy Bridge platform here are the testpmd flags I use for iofwd testing:

"--rxd=128 --rxfreet=32 --rxpt=8 --rxht=8 --rxwt=0 --txd=512 --txfreet=32 --txpt=32 --txht=0 --txwt=0 --txrst=32 --txqflags=0xF01 --numa --burst=32 --mbcache=250 --total-num-mbufs=16383"

Regards,
/Bruce