From 640b96a33504fd30c67aa8ccf022fd2d7ed1ac45 Mon Sep 17 00:00:00 2001 From: Jon Mason Date: Tue, 21 Apr 2009 15:35:49 -0500 Subject: [PATCH] documentation: note cxgb3 fw limitation This patch describes a limitation of the Chelsio's T3 RNIC firmware that causes issues with NFS-RDMA. Signed-Off-By: Jon Mason --- cxgb3_release_notes.txt | 7 +++++++ nfs-rdma.release-notes.txt | 9 +++++++++ 2 files changed, 16 insertions(+) diff --git a/cxgb3_release_notes.txt b/cxgb3_release_notes.txt index dcfbe3e..5f2edaa 100644 --- a/cxgb3_release_notes.txt +++ b/cxgb3_release_notes.txt @@ -275,3 +275,10 @@ data to 64: server: ib_rdma_lat -c -I 64 client: ib_rdma_lat -c -I 64 server_ip_addr + +5) If you're running NFSRDMA over Chelsio's T3 RNIC and your cients are +using a 64KB page size (like PPC64 and IA64 systems) and your server is +using a 4KB page size (like i386 and X86_64), then you need to mount the +server using rsize=32768,wsize=32768 to avoid overrunning the Chelsio +RNIC fast register limits. This is a known firmware limitation in the +Chelsio RNIC. diff --git a/nfs-rdma.release-notes.txt b/nfs-rdma.release-notes.txt index f055f7a..fb25efb 100644 --- a/nfs-rdma.release-notes.txt +++ b/nfs-rdma.release-notes.txt @@ -195,3 +195,12 @@ NFS/RDMA Setup the "proto" field for the given mount. Congratulations! You're using NFS/RDMA! + +Known Issues +~~~~~~~~~~~~~~~~~~~~~~~~ + +If you're running NFSRDMA over Chelsio's T3 RNIC and your cients are using +a 64KB page size (like PPC64 and IA64 systems) and your server is using a +4KB page size (like i386 and X86_64), then you need to mount the server +using rsize=32768,wsize=32768 to avoid overrunning the Chelsio RNIC fast +register limits. This is a known firmware limitation in the Chelsio RNIC. -- 2.46.0