From: David Miller <davem@davemloft.net>
To: rick.jones2@hp.com
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 17:32:06 -0700 (PDT) [thread overview]
Message-ID: <20060629.173206.48800902.davem@davemloft.net> (raw)
In-Reply-To: <44A47042.8060203@hp.com>
From: Rick Jones <rick.jones2@hp.com>
Date: Thu, 29 Jun 2006 17:28:50 -0700
> 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?
People doing deep CMT chips have found out that all of that
prefetching and store buffering is unnecessary when everything is so
tightly integrated.
All of the previous UltraSPARC boxes before Niagara had a
streaming cache sitting on the PCI controller. It basically
prefetched for reads and collected writes from PCI devices
into cacheline sized chunks.
The PCI controller in the current Niagara systems has none of that
stuff.
next prev parent reply other threads:[~2006-06-30 0:32 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
2006-06-30 0:32 ` David Miller [this message]
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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