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...ffers of mergeable Rx > > header could be replaced. More importantly, we could reduce a cache > > line write if non offload are supported in mergeable Rx path. > > Why do you bother with mergeable Rx without offloads? Oh, my bad. I actually meant "without offloads __being used__". Just assume the pkt size is 64B and no offloads are used. When mergeable Rx is negotiated (which is the default case), num_buffers has to be set 1. That means an extra cache line write. For the case of non mergeable, the cache line write could be avoid by a trick like what the following patc...

On Tue, Feb 28, 2017 at 01:02:18PM +0800, Yuanhan Liu wrote: > On Wed, Feb 08, 2017 at 05:20:14AM +0200, Michael S. Tsirkin wrote: > > This is an update from v1 version. > > Changes: > > - update event suppression mechanism > > - separate options for indirect and direct s/g > > - lots of new features > > > > --- > > > > Performance

On Tue, Feb 28, 2017 at 01:02:18PM +0800, Yuanhan Liu wrote: > On Wed, Feb 08, 2017 at 05:20:14AM +0200, Michael S. Tsirkin wrote: > > This is an update from v1 version. > > Changes: > > - update event suppression mechanism > > - separate options for indirect and direct s/g > > - lots of new features > > > > --- > > > > Performance

...; > header could be replaced. More importantly, we could reduce a cache > > > line write if non offload are supported in mergeable Rx path. > > > > Why do you bother with mergeable Rx without offloads? > > Oh, my bad. I actually meant "without offloads __being used__". Just > assume the pkt size is 64B and no offloads are used. When mergeable > Rx is negotiated (which is the default case), num_buffers has to be > set 1. That means an extra cache line write. For the case of non > mergeable, the cache line write could be avoid by a trick like wha...