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Open Source and information security mailing list archives
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Date: Sat, 5 Sep 2020 03:01:08 +0000 From: "Brown, Aaron F" <aaron.f.brown@...el.com> To: Björn Töpel <bjorn.topel@...il.com>, "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org> CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>, "Topel, Bjorn" <bjorn.topel@...el.com>, "Karlsson, Magnus" <magnus.karlsson@...el.com>, "kuba@...nel.org" <kuba@...nel.org> Subject: RE: [Intel-wired-lan] [PATCH net-next v2 2/3] i40e: use 16B HW descriptors instead of 32B > From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of > Björn Töpel > Sent: Tuesday, August 25, 2020 4:36 AM > To: intel-wired-lan@...ts.osuosl.org > Cc: netdev@...r.kernel.org; bpf@...r.kernel.org; Topel, Bjorn > <bjorn.topel@...el.com>; Karlsson, Magnus <magnus.karlsson@...el.com>; > kuba@...nel.org > Subject: [Intel-wired-lan] [PATCH net-next v2 2/3] i40e: use 16B HW > descriptors instead of 32B > > From: Björn Töpel <bjorn.topel@...el.com> > > The i40e NIC supports two flavors of HW descriptors, 16 and 32 > byte. The latter has, obviously, room for more offloading > information. However, the only fields of the 32B HW descriptor that is > being used by the driver, is also available in the 16B descriptor. > > In other words; Reading and writing 32 bytes instead of 16 byte is a > waste of bus bandwidth. > > This commit starts using 16 byte descriptors instead of 32 byte > descriptors. > > For AF_XDP the rx_drop benchmark was improved by 2%. > > Signed-off-by: Björn Töpel <bjorn.topel@...el.com> > --- > drivers/net/ethernet/intel/i40e/i40e.h | 2 +- > drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 10 ++++------ > drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++-- > drivers/net/ethernet/intel/i40e/i40e_trace.h | 6 +++--- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 6 +++--- > drivers/net/ethernet/intel/i40e/i40e_txrx.h | 2 +- > drivers/net/ethernet/intel/i40e/i40e_type.h | 5 ++++- > 7 files changed, 18 insertions(+), 17 deletions(-) > Tested-by: Aaron Brown <aaron.f.brown@...el.com>
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