From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ralph Campbell Subject: [PATCH 1/2] IB/qib: limit the number of packets processed per interrupt Date: Mon, 02 Aug 2010 15:39:24 -0700 Message-ID: <20100802223924.8701.14389.stgit@chromite.mv.qlogic.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Roland Dreier Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org Don't processes too many packets without allowing other IRQ functions a chance to run. Otherwise, there is a chance of getting "soft lockup" messages and poor application response times. Signed-off-by: Ralph Campbell --- 0 files changed, 0 insertions(+), 0 deletions(-) diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c index f15ce07..9cd1936 100644 --- a/drivers/infiniband/hw/qib/qib_driver.c +++ b/drivers/infiniband/hw/qib/qib_driver.c @@ -335,7 +335,7 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts) smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ } - for (last = 0, i = 1; !last; i += !last) { + for (last = 0, i = 1; !last && i <= 64; i += !last) { hdr = dd->f_get_msgheader(dd, rhf_addr); eflags = qib_hdrget_err_flags(rhf_addr); etype = qib_hdrget_rcv_type(rhf_addr); -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html