Messages in this thread | | | Subject | Re: 2.6.9-rc1-mm3 | From | Peter Osterlund <> | Date | 03 Sep 2004 17:59:37 +0200 |
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Andrew Morton <akpm@osdl.org> writes:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.9-rc1/2.6.9-rc1-mm3/ > > - Added the m32r architecture. Haven't looked at it yet. > > - Status update on various large patches in -mm: > > - The packet-writing code is awaiting resolution of the > abuse-of-elevator-fields problem.
It doesn't abuse the elevator fields any more. That was fixed by the packet-writing-avoid-bio-hackery patch which is already in -mm.
One problem that does remain though, is that when dumping huge amounts of data to a CD or DVD disc (so that you get memory pressure), the effective writing speed of other block devices (like IDE hard disks) is reduced to the same speed as the packet device.
I have posted a patch that fixes this problem by limiting the amount of writeback data in the packet driver, but unfortunately it makes the effective writing speed of the packet device suffer a lot. The proper fix is probably to improve the filesystem and/or VM code to start I/O operations in sequential order a lot more often than it currently does.
-- Peter Osterlund - petero2@telia.com http://w1.894.telia.com/~u89404340 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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