cs161-list April 2002

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10 participants
21 discussions

Course Announcement: Change of due date for design doc.

by Alexandra (Sasha) Fedorova

The due date for design document for Assignment 4 has been moved to WEDNESDAY, April 10, at midnight. We have decided to move the date, so that you have a chance to go to the Asst4 section before writing the design doc. -- Sasha

22 years, 1 month

mike's section

by mike vernal

Just a reminder for those of you who are not in my section but need to come. My section has moved to Sever 212. Check the web page for a map. thanks, -mike

22 years, 1 month

sol3 released

by David Holland

The solution set for assignment 3 has been released and can be gotten from the assignments area of the course web page. It's not the world's fastest or most elegant, but it should be reasonably comprehensible and it seems quite stable. -- - David A. Holland / dholland(a)eecs.harvard.edu

22 years, 1 month

Another little patch...

by David Holland

There seems to have been an off-by-one error in the lhd driver that kept it from using the last sector on the disk. Patch follows. (This will be posted on the web site, and will also be included in the upcoming sol3 release.) Index: src/kern/dev/lamebus/lhd.c =================================================================== RCS file: /disk/disk0/cs161/CVSREPO/os161/src/kern/dev/lamebus/lhd.c,v retrieving revision 1.8 diff -u -r1.8 lhd.c --- lhd.c 2001/09/21 20:47:59 1.8 +++ lhd.c 2002/04/02 05:28:34 @@ -187,7 +187,7 @@ } /* Don't allow I/O past the end of the disk. */ - if (sector+len >= lh->lh_dev.d_blocks) { + if (sector+len > lh->lh_dev.d_blocks) { return EINVAL; } -- - David A. Holland / dholland(a)eecs.harvard.edu

22 years, 1 month

Announcements

by Georgi Matev

Hi all, A solution to the midterm has been posted at http://www.courses.fas.harvard.edu/~cs161/handouts/index.html. An addendum to assignment 4 explaining the mechanics of using SFS is posted at http://www.courses.fas.harvard.edu/~cs161/assignments/index.html. -Georgi

22 years, 1 month

Course Announcements

by mike vernal

Greetings -- Midterm is on Thursday! Just a reminder for those who may have been incapacitated in lecture. There will be a review section tonight at 8:30 pm in MD 223. We will be going over the 1999 midterm and fielding general questions. Office Hours for this week will be tomorrow. They have been posted on the web site. They are as follows: Drop-In: Dave, MD 213/209 4 - 5 pm: Sasha, MD 233 6 - 7 pm: Georgi, 2nd Floor 7 - 8 pm: Nick, 2nd Floor 8 - 9 pm: Mike, MD 208 Also, the LFS and FFS papers have been posted, as have the 1999 and 2001 midterms. -mike

22 years, 1 month

Correction to the "external fragmentation"

by Alexandra (Sasha) Fedorova

Yesterday, during the midterm review session we gave you an incorrect explanation of the question why external fragmentation can occur in FFS. This was one of the questions on last year's midterm. We told you that external fragmentation can occur because you pre-allocate a chunk of space for inodes, and then you cannot use this space for data blocks, even if it is not entirely used by inodes. Here is the correct explanation (quoting Margo): > External fragmentation has nothing > to do with inodes. It's exactly what happens on news partitions. > You end up allocating a lot of fragments and are unable to allocate > blocks. Sorry about the confusion. See, the exam is hard! You have to study. --Sasha

22 years, 1 month

Old midterms posted on the web

by Georgi Matev

Some of you mentioned that you don't have the course reader. I just posted the old midterm exams from 1999 and 2001 on the site under handouts. The one from 2001 is probably quite similar in format to the one you will do on Thursday. Looking over the other one is also useful though. -Georgi

22 years, 1 month

Fwd: Re: How much does the midterm cover

by Georgi Matev

Here is the official word on how much the midterm will cover. Those of you who don't have a hard copy of the FFS paper can find it at http://citeseer.nj.nec.com/mckusick84fast.html. -Georgi >Date: Mon, 1 Apr 2002 20:51:02 -0500 (EST) >From: Margo Seltzer <margo(a)eecs.harvard.edu> >To: matev(a)fas.harvard.edu >Subject: Re: How much does the midterm cover > >Midterm covers everything in class up until break. I.e., FFS but not >LFS. > >- M

22 years, 1 month

Midterm Review sessions

by Alexandra (Sasha) Fedorova

As you remember this week there is a midterm. We will be holding one review session today from 6 to 7:30 PM in MD319, instead of regular Monday sections. Another sessions will be held on Tuesday, we will announce the time shortly. -- Sasha

22 years, 1 month

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cs161-list April 2002