From: Rick Jones <rick.jones2@hp.com>
To: David Miller <davem@davemloft.net>
Cc: bos@pathscale.com, akpm@osdl.org, rdreier@cisco.com,
mst@mellanox.co.il, openib-general@openib.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 39 of 39] IB/ipath - use streaming copy in RDMA interrupt handler to reduce packet loss
Date: Thu, 29 Jun 2006 17:28:50 -0700 [thread overview]
Message-ID: <44A47042.8060203@hp.com> (raw)
In-Reply-To: <20060629.164623.59469884.davem@davemloft.net>
> If you bypass the L2 cache, it's pointless because the next
> agent (PCI controller, CPU thread, etc.) is going to need the
> data in the L2 cache.
>
> It's better in that kind of setup to eat the L2 cache miss overhead in
> memcpy since memcpy can usually prefetch and store buffer in order to
> absorb some of the L2 miss costs.
I thought that most PCI controllers (that is to say the things bridging
PCI to the rest of the system) could do prefetching and/or that PCI-X
(if not PCI, no idea about PCI-e) cards could issue multiple
transactions anyway?
rick jones
next prev parent reply other threads:[~2006-06-30 0:28 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-29 21:40 [PATCH 0 of 39] ipath - bug fixes, performance enhancements, and portability improvements Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 1 of 39] IB/ipath - Name zero counter offsets so it's clear they aren't counters Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 2 of 39] IB/ipath - update copyrights and other strings to reflect new company name Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 3 of 39] IB/ipath - Share more common code between RC and UC protocols Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 4 of 39] IB/ipath - fix an indenting problem Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 5 of 39] IB/ipath - fix shared receive queues for RC Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 6 of 39] IB/ipath - Allow diags on any unit Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 7 of 39] IB/ipath - update some comments and fix typos Bryan O'Sullivan
2006-06-29 21:40 ` [PATCH 8 of 39] IB/ipath - remove some duplicate code Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 9 of 39] IB/ipath - don't allow resources to be created with illegal values Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 10 of 39] IB/ipath - fix some memory leaks on failure paths Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 11 of 39] IB/ipath - return an error for unknown multicast GID Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 12 of 39] IB/ipath - report correct device identification information in /sys Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 13 of 39] IB/ipath - enforce device resource limits Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 14 of 39] IB/ipath - removed unused field ipath_kregvirt from struct ipath_devdata Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 15 of 39] IB/ipath - print better debug info when handling 32/64-bit DMA mask problems Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 16 of 39] IB/ipath - enable freeze mode when shutting down device Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 17 of 39] IB/ipath - use more appropriate gfp flags Bryan O'Sullivan
2006-06-30 0:02 ` Andrew Morton
2006-06-29 21:41 ` [PATCH 18 of 39] IB/ipath - use vmalloc to allocate struct ipath_devdata Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 19 of 39] IB/ipath - memory management cleanups Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 20 of 39] IB/ipath - reduce overhead on receive interrupts Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 21 of 39] IB/ipath - fixed bug 9776 for real. The problem was that I was updating Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 22 of 39] IB/ipath - fix lost interrupts on HT-400 Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 23 of 39] IB/ipath - disallow send of invalid packet sizes over UD Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 24 of 39] IB/ipath - don't confuse the max message size with the MTU Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 25 of 39] IB/ipath - removed redundant statements Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 26 of 39] IB/ipath - check for valid LID and multicast LIDs Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 27 of 39] IB/ipath - fixes to performance get counters for IB compliance Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 28 of 39] IB/ipath - Fixes a bug where our delay for EEPROM no longer works due to compiler reordering Bryan O'Sullivan
2006-06-30 0:07 ` Andrew Morton
2006-06-30 21:08 ` Roland Dreier
2006-06-29 21:41 ` [PATCH 29 of 39] IB/ipath - RC receive interrupt performance changes Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 30 of 39] IB/ipath - purge sps_lid and sps_mlid arrays Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 31 of 39] IB/ipath - drop the "stats" sysfs attribute group Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 32 of 39] IB/ipath - support more models of InfiniPath hardware Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 33 of 39] IB/ipath - read/write correct sizes through diag interface Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 34 of 39] IB/ipath - fix a bug that results in addresses near 0 being written via DMA Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 35 of 39] IB/ipath - remove some #if 0 code related to lockable memory Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 36 of 39] IB/ipath - Ignore receive queue size if SRQ is specified Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 37 of 39] IB/ipath - namespace cleanup: replace ips with ipath Bryan O'Sullivan
2006-06-29 21:41 ` [PATCH 38 of 39] IB/ipath - More changes to support InfiniPath on PowerPC 970 systems Bryan O'Sullivan
2006-06-29 21:53 ` David Miller
2006-06-29 22:01 ` Bryan O'Sullivan
2006-06-29 22:04 ` David Miller
2006-07-03 22:25 ` Anton Blanchard
2006-07-04 4:55 ` Michael S. Tsirkin
2006-07-06 22:37 ` Benjamin Herrenschmidt
2006-07-06 23:34 ` Bryan O'Sullivan
2006-07-06 23:39 ` Benjamin Herrenschmidt
2006-06-29 21:41 ` [PATCH 39 of 39] IB/ipath - use streaming copy in RDMA interrupt handler to reduce packet loss Bryan O'Sullivan
2006-06-29 21:50 ` David Miller
2006-06-29 21:59 ` Bryan O'Sullivan
2006-06-29 22:03 ` David Miller
2006-06-29 23:34 ` Bryan O'Sullivan
2006-06-29 23:46 ` David Miller
2006-06-29 23:55 ` [openib-general] " Ralph Campbell
2006-06-30 0:28 ` Rick Jones [this message]
2006-06-30 0:32 ` David Miller
2006-06-30 0:44 ` Rick Jones
2006-06-30 0:47 ` David Miller
2006-06-30 16:31 ` [PATCH 0 of 39] ipath - bug fixes, performance enhancements,and portability improvements Michael S. Tsirkin
2006-06-30 17:00 ` Bryan O'Sullivan
2006-07-01 19:43 ` [PATCH 0 of 39] ipath - bug fixes, performanceenhancements,and " Michael S. Tsirkin
2006-07-01 22:35 ` Andrew Morton
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