From: Juergen Gross <jgr...@suse.com> Date: Tue, 12 Jun 2018 08:57:53 +0200
> The max number of slots used in xennet_get_responses() is set to > MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD). > > In old kernel-xen MAX_SKB_FRAGS was 18, while nowadays it is 17. This > difference is resulting in frequent messages "too many slots" and a > reduced network throughput for some workloads (factor 10 below that of > a kernel-xen based guest). > > Replacing MAX_SKB_FRAGS by XEN_NETIF_NR_SLOTS_MIN for calculation of > the max number of slots to use solves that problem (tests showed no > more messages "too many slots" and throughput was as high as with the > kernel-xen based guest system). > > Replace MAX_SKB_FRAGS-2 by XEN_NETIF_NR_SLOTS_MIN-1 in > netfront_tx_slot_available() for making it clearer what is really being > tested without actually modifying the tested value. > > Signed-off-by: Juergen Gross <jgr...@suse.com> > Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com> Applied, thanks. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
