On Mon, May 11, 2015 at 01:40:07PM +0200, Yann Droneaud wrote: > 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. Will do. > > Anyway, you haven't addressed the comments embedded in the patch in my > reply [1] to your v2 patch. Changing comments was quite easy, the rest will take a bit more, v4 will address it. > > [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