Hi, Le lundi 11 mai 2015 à 03:04 -0700, Yuval Shaia a écrit : > By default, IPoIB-CM driver uses 64k MTU. Larger MTU gives better performance. > This MTU plus overhead puts the memory allocation for IP based packets at 32 > 4k pages (order 5), which have to be contiguous. > When the system memory under pressure, it was observed that allocating 128k > contiguous physical memory is difficult and causes serious errors (such as > system becomes unusable). > > This enhancement resolve the issue by removing the physically contiguous memory > requirement using Scatter/Gather feature that exists in Linux stack. > > With this fix Scatter-Gather will be supported also in connected mode. > > This change reverts the some of the change made in commit > e112373fd6aa280bd2cbc0d5cc3809115325a1be > ("IPoIB/cm: Reduce connected mode TX object size)". > > The ability to use SG in IPoIB CM is possible because the coupling > between NETIF_F_SG and NETIF_F_CSUM was removed in commit > ec5f061564238892005257c83565a0b58ec79295 > ("net: Kill link between CSUM and SG features.") > > Signed-off-by: Yuval Shaia <yuval.shaia@xxxxxxxxxx> > --- > v2: Enhance commit log message > > I'd like to thank John Sobecki <john.sobecki@xxxxxxxxxx> and > Christian Marie <christian@xxxxxxxxx> for helping me with reviewing this patch. > I will be glad if you can ACK it. > > v3: Add an empty line to start a new paragraph and use 12 hex-digits identifier Thanks, but you don't have to use the full commit identifier, 12 characters were enough. Anyway, you haven't addressed the comments embedded in the patch in my reply [1] to your v2 patch. [1] http://marc.info/?i=1431335754.25060.26.camel@xxxxxxxxxx http://mid.gmane.org/1431335754.25060.26.camel@xxxxxxxxxx Regards. -- Yann Droneaud OPTEYA -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html